Why the front of the Jet Engine is NEVER painted..
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- Опубліковано 16 січ 2025
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Why are most aircraft painted WHITE and why is the front of the Jet engines NEVER painted? Those are a few of the questions I will explain in this weeks video. Make sure to subscribe to the channel and highlight ALWAYS on the little notification bell to avoid missing any new content!
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I want to send a huge "Thank You" to the featured channels in todays episode. Check out their channels and full length videos below 👇🏻
Boeing (B737MAX display)
• Video
Safran (LEAP engine explained)
• How does a jet engine ...
flightdeck2sim (Use of Anti Ice systems B737)
• PMDG 737 | Engine and ...
MrMusicoutloud (Boeing 747 painting time-lapse)
• Time lapse painting a 747
Westjet (Painting the Magicplane timelapse)
• Painting the WestJet #...
Mdx media (Painting a B737MAX)
• Video
Buzzfeed Multiplayer (Difference in car surface temperature)
• Do Black Cars Really G...
This is the most interesting channel on UA-cam
Thank you so much! 🙏
Mentour Pilot I got a question about this... what’s the crusing speed for a Boeing 737? qwq
@@VelocityEditsuwu Usually about 400 - 450 knots. I don't know how fast different airlines fly them for fuel savings but you start to straddle the overspeed limit at a little under 500. It also limits your speed to fly lower, so while I in my simulator may choose to cruise at 40.000ft, airlines will very often go at 32 or 35k feet, as imposed by air traffic control.
@@VelocityEditsuwu m0.78
@@maiden5427 idk if its just me but i dont like using mach as speed unit as the speed of sound varies depend on the altitude.
As a retired (a very long time ago!) RAF pilot (Phantoms/Tornados) the best thing about your videos is your lovely little dog. Bless him (or her). Keep up the good work and stay safe! Cheers from a rather drizzly Sevenoaks, Kent, UK.
From maintenance perspective, reason No.5:
Damages on the skin of the aircraft are easier to detect if’s color is white. Like cracks, corrosion, rivet gone loose etc.
Is this true? I would have thought damage would be easier to see in darker colours, especially from a distance, while lighter colours could mask and small cracks at a distance. I'm no mechanic, so nor trying to judge, just an opinion that I thought.
@@peterfranklin4019 Cracks and loose rivets would show up mostly by their shadows and they are easier to see against lighter colours. Likewise, corrosion tends to darken the metal.
I thought it also was to protect interior wiring and electronics from getting to hot..
@@knocksensor3203 Heat exposure is more like an issue with composit aircraft due to the use of resin in composit materials.
Very interesting. I remember working as a plant engineer we used to say be very careful about modifications, even when it see seems trivial. You often discover there's a reason why something was done in a certain way.
Fascinating! I’ve noticed that commercial airplanes are predominantly white and now I know why! You are requiring me to exercise my brain during this pandemic and now that I’m hooked, I’ll continue to view your videos all the time! I’m a grandma at 69 years young and feel that stimulating my brain will help to stave off dementia and love everything about the aspects of flying. My husband and I love to fly and also love hearing the wheels lock into place. We usually get our seats by the wings to see the flaps. Never boring! Thanks!!
Happy to hear! Welcome to the channel!
@MentourPilot , a degraded painted surface would also provide a surface with micro pits that would promote the formation of ice and provide places for the ice crystals to start growing. A smoother surface would minimize the chances of that happening.
This guy truly is a pilot. Patience is the middle name, delaying the answer is the game.
This guy truly is a pilot. Patience is the middle name, delaying the answer is the game.
I hit the subscribe at 2:50
Hey, The Almighty Algorithm tubers mostly live and die on likes videos over 10 minutes, and likes people to sit through the whole video in one sitting, which is why most people stay under 30. For The Algorithm to not penalize him he needs the video to be at least that long and to hold the answer to the end instead of providing extra detail at the end because his videos won't be recommended if you tune out early. He'd probably be happy to answer the question faster if it wouldn't result in The Algorithm not recommending his videos anymore.
Happy birthday Mentour! Just wanted to say that every video you put out I learn something new about civilian aviation. I unfortunately can not be a pilot myself due to health issues but I’m super interested in aviation and you provide all this content for me to keep busy with. Thanks and keep up the great work!!
Hi Mentour! Another reason to paint the planes white is that it makes it easier to find fatigue cracks or liquid leaks. Great channel! I love your videos!
Certainly easier for pilots doing pre-flight checks to detect, if there's some leak or some other irregularity in plane.
everyone: "painting our planes white will make us save money and fly safer"
Southwest Airlines: "hold my jetfuel ..."
R to the Izzy I was thinking about Southwest during this video also
What about southwests maintenance
@Owen Fantuzzi didnt wow just got bankrupt?
@@novconoco7785 They resumed services recently.
@@MarkSmith-js2pu Same here, and also Spirit. But what about those unpainted aircraft like the recently retired American Airlines MD-80's?
I can see a small brown brush like creature which could easily be used to paint an engine!
Haha! Poor Patxi
Mentour Pilot 😆 🐕 ✈️ 🤣
he's a cute little sleepy alien rescued from Area 51
My golden puppy discovered how to paint....Pity our car....and garage floor
Oh pity! That dog?!😱🐶🐕🐕🌭
The aluminum skin used on the front of the fan case is called a lip skin. The lip skin cavity has bleed air from the engine which is very hot to melt any precipitation that forms as ice.
There's a valve that mixes the hot bleed air with outside air to keep the freeze action from forming ice that damages the engine if ingested.
Indeed. It contains hot bleed-air when the engine anti ice is activated
Is it hot enough that paint simply won't last? You don't paint the tail pipe on your car either for obvious reasons.
I enjoyed reading this comment instead of wasting 12 minutes lol
Technically you could paint it - but airlines are cheapskates. The paint used on the SR-71 would handle the heat comfortably.
The surface could also be anodised in a number of different colours too. All this cost serious money however.
In the plane I work on, the inlet anti-ice is tapped straight from the 14th-stage bleed. It never even touches the precooler. Our inlets get super hot.
Excellent explained as always. I knew these things besides the trick with the heating from the engine to prevent icing. That proves how much thought and engineering goes into an aircraft.
Last week I flew to Austin, TX on Southwest and the aircraft was HOT. To the point where the flight attendants "STRONGLY encouraged" everyone to close their window shades and open the overhead vents to cool down the aircraft, so I can certainly see your point Mentour, thanks for sharing!
Love your videos. You don't just state the facts, you make every subject interesting, easy to grasp, and enjoyable to listen to. Not everybody teaching others has your skills.
Mentor Pilot: “Typically planes are painted white....”
Air New Zealand: *Laughs in Kiwi*
Check out Air NZ's black planes
All Blacks! All Blacks! 🖤
Does this mean that our Air New Zealand planes are more dangerous to fly in?
Apparently not, they have it sorted somehow
Yes, I immediately thought of Air NZ - not sure I want to fly with them.....
That high you get from learning something new..... It's not many channels that makes me this excitied about clicking on the video. Well done!
Mentour you’ve been a godsend I’ve always had questions like this and now finally there is someone to give a detailed non biased explanation.
I so agree.. thanks
One of the hardest details to recreate in a scale model jetliner is that metallic rim on the engines! Great show!
Is that metallic rim made of aluminum?
@@timothybradek3560 I assume it is. I have used several techniques and metallics but the AK477 chrome over gloss black base looks very accurate. It supposed to recreate super shiny chrome but at smaller scales it comes off very real looking.
I just wanted to say that I really miss pait jobs like Northwest airlines used to fly. And to know that in the future possibilities of seeing beautiful paint jobs on aircraft it's getting low is just sad.
Nice video and great content!
It's been 6 years ling since I have been following your channel! ❤️❤️
One of the best intros ever! I absolutely love it! This channel has inspired me a lot!
Your explanations are excellent. Always looking forward to your next episode. Thank you for taking the time to educate us on so many facets of aviation.
Same-same.. thanks for including me, lol.
Thank you again Petter! Knew the flaking aspects but didn't think about the thermal side of the equation. Also thanks for teaching me about reusing the turbines to address freezing on the engine cowell. Didn't think about aerodynamic aspects of worn paint. You rock as always sir. Living vicariously through your experience. Safe flights my friend. P
What a nice compliment, and for that.. you rock too! Thanks P
@1:11 I’m glad you pointed to where the engine is, I wasn’t sure.
I'm pretty sure he was trying to draw your attention to fact that the front of the engine wasn't painted.
Lol
This is literally my first video I ever watched of you and all I have to say is congrats on 500,000 subscribers.
Always learning from you. :) Keep up the good work!
Thank you! Glad you like it!
Thanks Siryour Mentour lessons are always very educative,I always enjoy and stop by for lessons
Love that you mentioned FD2S :D
Great!
Jump N´ Run Where is the mention??
I am so addicted to watching your videos. I can never stop at just watching one. I end up watching another, and then another. I very recently subscribed to you so I have yet to see all your videos. I really love you, and thank you for making these videos.
Leave it to Mentour Pilot to find a question I'd never thought of, but once I hear it I NEED THE ANSWER!
Hahaha! More of those to come!
Your videos are well organized and well thought out. Always informative. Good level of technical detail. Kudos.
I love how simply you explain this. So simple any layperson can understand.
And by the way I love that little dog. How are the puppies doing now in their new homes?
All your videos all so Addictive.. Always learning something new...
Mentour I absolutely adore your channel. You teach me so much.
Vsause brought me here! Actually, I can't remember how I came across this channel. Damn glad I did though. I heard the Vsause shout out too. Lots of great learning on that channel too.
as an engineer, I find that with white color it's easier to detect and notice dirt and any liquid leaks
yusuf alghareeb So you need to be an engineer to detect leaks and notice notice dirt?
Funny I could do the prior to attaining my engineering degree...
Greenid Guy Maybe he is an flight engineer, which is a job, which requires detecting leaks. Or engineer who designs stuff and needs to monitor performance and leaks. He’s clearly not stating you need to be one to detect them. For example a pilot could say “As a pilot, i find that having wings on an airplane makes it easier to keep it in the air”, which does not imply that you need to be a pilot to figure out planes need to have wings, just that it makes his jobs easier.
MK Actually he is a pompous ass...
Sterlingjob Engineers aren’t used on most flights these days.
... and also lightning strikes
A man I worked with was a B1 maintenance chief, and he moved to a civilian airline. We had this conversation and he touched on all these points, as well as damage shows a little better on white. Cracks, and impacts show very well, but on the B1 they took 10 times as long to inspect the surface for damage due to the color. Good video.
So the engines won't ingest flakes of paint I would guess.
Good guess my friend! That’s one of the reasons
And so we have gently touched on the forbidden topic of bleed-air...
That’s the engine anti ice thing Thts why is not painted
@@andersonrodriguez8258 Yeah, that seems logical M8.
Fredrik Norrman What. You didn’t watch the video?
HANDS DOWN PETER...YOU TAKE PROFESSIONALISM TO A NEXT LEVEL AND FOR SURE YOU'VE INSPIRED 100'S OR EVEN 1000'S TO PURSUE THEIR DREAMS. THANK YOU
I admire how he always found the words to dont worry anyone: “this is not great “
“This is not a very good thing”
When you mentioned ice build up at the front of the engine and being sucked into the engine reminded me or a race car I worked on. I put a Holly 750CFM carburetor on the engine and at idle I watched the engine "EAT" the air horn. It looked like sand in an hour glass flowing into the carburetor. The engine needed an 1150CFM carburetor to stop this.
Thumbs up from cadman. Another very interesting and informative video.
Excellent James! See you in the app!
Very nice information. You always explain so good. Everybody will understand. Most interesting!
I love the fact you have a dog with you who is just chilling out.
Joe Kinchicken excellent. Love your sense of humor.
Very interesting. Thank you for sharing.
Well, experience tells me there are a couple of reasons why engines and leading edges of wings are not painted:
1. Anti-icing/de-icing Airplanes have different ice countermeasures implemented. Some of them, like the ATR simply sends rough air bursts destroying formed ice. Others use air from APU or the engines to heat or clean the surface. Using paint would disrupt this.
2. Screw-ups. Airplanes are mathematically engineered to obtain the best air-flow around the wings and in front of the engines. Applying a layer of paint disrputs those calculations, resulting in a botched up airflow. Not to mention, poor paintjob or a paintjob that wears out will eventually have iregularities on it's surface. This means there are places where waterdroplets can rest and start forming ice. And if ice forms on the leading edge, this has a severe impact on lift. For the engine, ice deposits can form which can then break and be taken in the engine itself
Yay! I knew all the reasons before watching!!
Interesting stuff,
I really like the paint jobs on both the,” Alaska Airlines” ,
And the air New Zealand planes,
Of course any plane that I can ride in is awesome 👍
Another great video from you, Mentour. Thanks!
It's always fantastic to learn from you... thank you! All the best from brasilian pilots!
I thoroughly enjoy your videos! Thanks again!
Could you explain "bleed air?" Is air being bled from compressor for anti-ice; or is there some system that is always bleeding air, but that gets diverted to anti-ice when needed?
Also, someone else had similar question, but, What happened to the gray paint on the wings? I think it was called corogard or similar, but lately, most airliners have body colored wings.
That’s a great question
bleed air is air taken from the high pressure compressor stages, that's why is hot. and only gets diverted when using anti-ice because it reduces engine efficiency. In some cases bleed air is also used to pressurize the cabin. Also bleed air from the APU is used to start the main engines, and can be cross-bleed to start one engine with the other.
@@robertoricardoruben Thanks, almost seems like steam engine diversion schemes.
@@victorwong3311 Really? I know nothing about steam engines, besides the very basics, I'll read about them
@@victorwong3311 Yes. It's the same principle as in steam engines.
I was on a Eurowings flight into Berlin in the dark a couple of years ago, and there was a 10 minute delay because (we were told) the black paint on the plane confused the automatic system that attaches the jet bridge and they had to wait for an operator to do it manually. I didn't get a look at the plane to see what it was painted as, but Google reveals there was one A320 painted in Borussia Dortmund colours, so maybe I happened to get that one.
Good informative video. I agree with all points raised here. I'm not an airline pilot, but I have flown private planes. I had no idea that the engine leading edge is heated in the way described here.
About the paint colors, there was a Pepsi painted Concorde in the 90s and because it was blue, it couldn't cruise past Mach 2.0 (I think it was stuck at around 1.8) due to the fuselage heating up too much and warping.
But relative to that, the SR 71 blackbird was black though and colour didn't pose a problem, well I know material used to build it may possibly be a factor
Then again, you are right because on the ground the SR 71 used to leak fuel because of the contraction in the fuselage and then those leaks use to seal up during flight
And that raises another question that’s been bothering me. A little more down to earth though. Why, when cars are in need of additional protection from the sun is almost all window tinting dark black or another dark colour? I understand the screen being dark tinted for the same reason we wear our aviators but when they advertise tinting to protect the car interior and keep the occupants cooler you’d almost expect windows to be tinted white or some other light colour. Not expecting an answer to this but would be interested to know if others have pondered the same question? The edit, how rude of me, I forgot to say how good the channel is and love your nice and simple explanations of what are often not so nice and simple questions. Keep up the good work Petter & the team. 👨🏻✈️ 🛫👍
Imagine room with windows facing sun - with curtains and without...
You really nailed it this time with the "As always I'm hoping you are doing absolutely fantastic" this week. Thank you
Very clear and well-spoken.
I’ve never thought of this but wow
As a thermal engineer in aeronautics, I was nor sure I would learn anything in that particular video, but I did! So thank you, and have a fantastic day too!
It would also be a good video about differences between anti-ice and de-ice systems
Thomas anti ice should be activated prior to ice accumulation and left on until icing conditions are gone. De-ice is a system used after ice has accumulated. Usually de-ice systems use rubber boots on the leading edge of wings, stabilizer and vertical stabilizer.
In the aerospace biz an aircraft (or rocket for that matter) that has been built but not sold is called a "white tail". On a different subject, you may remember when the first space shuttles were launched the external tank was painted white. Eventually someone pointed out the cost of launching paint.
The factory first paint (green in this case) is called “Primer” irrespective of its colour or function.
FR primer to be specific.
Once again, thank you! I love your channel!
The dog feels addressed when hearing the word "great" - love it :D
You are slowly helping get over my fear of flying Ty for that
I think it would be worth the extra money to have Patxi painted on the plane.
I think so to!!
Or strapped to the nose, like a mascot on a truck-grille.
Just kidding!
Air New Zeeland's all black planes are quite cool though :)
Very interesting, as always ! Thanks for posting !
Oustanding video Peter. Keep em coming. Hello from San Diego California!
Thank you so much!
A great answer to a question I never thought to ask.
How long do the tyres last plus how much are they each 🤔..ps love the video's keep them coming..
Different from airplane to airplane
I was a vendor to FedEx. Ten years ago, the DC-10 tires were replaced every 120 cycles.
A takeoff and landing was considered one cycle. At that time, the tires were $6,000
each and that included the wheel and the tire balanced at 130MPH. I's sure the numbers
are different today. Definitely more expensive.
A380 tires were said to cost ~$80k each
@@g00rb4u Running an airline is not for the faint of heart. A new A-380 is
is $445 million plus taxes, license and dealer prep. Tires and wheels that cost
$80K seems reasonable. I'm glad I drive a Hyundai.
@@brucenadams1 I saw the mechanics from a budget airline down at the salvage yard buying those mini spare tires to put on their planes so they didn't have to pay full price.
You are excellent in present your programs
Thank you! So glad you think that
My personal favorite is an American Airlines shiny chrome DC10.
They used to polish their aircraft to save weight over paint.
I loved the DC10. My favorite airplane to fly on. Unfortunately with all of the calamities involved (not necessarily design flaws), they ended up in the freight department.
@@dryan8377 it was a good airplane except for the initial cargo door design on the early production models.
Deregulation of extended flight over open water is what REALLY did the 3 engine paradigm to rest concerning commercial flights.
More fuel efficient 2 engine designs plus glass cockpits took over starting in the mid 90s.
One less flight crewman and one less engine per plane add up in savings very quickly!
Chrome?? Never. Maybe try polished aluminum..
@@airgliderz chrome colored is what I meant.
Great video as always...Also noticed the “mentour crew” thing you are wearing around your next..though looks like the “mentour” ID is missing!
Silver paint schemes are actually colour on metal that's supposed to look like metal or they just leave it be?
Those are the prettiest. Today I only see it on Aeroflot, before American also had this.
I would think American Airlines used a gloss clear coat Aluminum skin. I will ask my father he work for American Airlines for 30 years. I do know they do paint the composite plastic parts and the new aircraft a battleship gray color.
Ok my father just got back to me. He said American Airlines polished the aluminum skin to a high shine. So no paint or clearcoat on the shiny silver skin. Just polished aluminum. I guess they spent that cash on ton of Tuttle Wax.. LOL
@@Patrick-od2zc Beautiful! The best things in life are usually the simplest I guess :)
And to add on it, it's probably the livery that takes the least amount of heat, is lowest cost, and today at least, would be unique.
Thanks for the answer
Patrick Holy shit! You polish planes with something akin to Brasso or Magic Wad like the military uses on their brass. It’s rub rub rub and repeat a trillion times. They used to use a big double headed buffer that they probably still sell at Aircraft Spruce &Specialty company. I had a Cessna 150 that I stripped due to the prior owner using the wrong primer. Buffing something that big is a big job, a 737 I couldn’t imagine even if they are using a large mechanized rig like a car wash buff on an articulated arm.
Regarding paint scheme mass (and polished aluminium such as used on the old American Airlines schemes) - an informative summary is provided by Boeing here:
@t
The mass of paint on a 737 is about 81 kg (versus just 11 for stripes and logos only)...
Typical savings in fuel costs are negated by extra maintenance (e.g. repolishing ~4 times per year rather than painting every 4 years) so the annual cost of operating a polished short range single aisle aircraft is ~$90,000 more (1998 estimate). This left the matter largely to aesthetics - until the increased use of composite materials in designs necessitated paint.
Company: my livery is so colourful!
Wow air: hold my *Brennivin*
Great channel... glad I found it!
Ha this topic is really FANtastic
Hahaha! Glad you liked it!
@@MentourPilot as all of your topics ofcourse!
Best tune on U Tube never get tired of it,
10:08 - Well, that will not be the case if flying over snow covered mountains, like Los Andes.
Very informative video
Thank you for sharing
You’ve been such a great help.
Patxi: Yes I want to now that... Awesome!
I remember the old American Airlines livery where most of the fuselage was shiny polished aluminium with red, white, and blue horizontal stripes. Considerably lighter than a full paint coat but very expensive to maintain.
I got a great deal from Earl Scheib when I took my 737 in for some touch-up work!😉
RogerC Funny you should bring up that memory. I’m sure that quite a number of subscribers are curious about old Earl. So you too are a child of the 50’s-60’s. Thanks for the chuckle.
@@dheyes803 Yes! I remember well those TV commercials: "I'm Earl Scheib, and I'll paint any car, any color for $29.95. No ups, no extras."
@Dale Poncy Hi Dale, No doubt you are younger! It seems these days that most of the people I come in contact with are.
Wow, very interesting. I only knew about the heat absorbing reason so it makes total sense
I'm unsure if this question has been asked before and I rather have a direct answer from a pilot or any aerospace engineers here; why do some jet engines have a cone on the core exhaust? Does it have a specific function?
It is for making the flow of air more uniform, creating less drag and increasing thrust and efficiency. If you have basic knowledge on how a jet engine works, the final stage is the turbine, which is used to power the compressor and fan. The turbine is made from a quite big disc with blades attached to it, and of course, the air passes only through the blades. And here is the problem, the surface area of the blades is smaller than the total surface area of the turbine, which means there will be a cavity, right behind the disc, for air to fill, which will decrease exhaust speed. You can imagine the principle as some water flowing fast through a small pipe and suddenly transition to a larger pipe, this will obviously make it slower. But if we fill in the gap with a cone, we can keep the exhaust speed constant by mantaining the same cross section area or even shrinking it. If you are talking about that hole or that pipe sticking out of the cone, that is the bleed for the oil vapours.
the cone allows the ANNULAR exhaust to gradually fill in the flow cavity in the center of the exhaust which is created by the turbine having a shaft and turbine discs in the middle.
the jet's exhaust is like a doughnut in crosssection and the cone allows for a less drag inducing filling in of the hope
Petter,
Great video and info (as always)!
God bless
Paul
Actually there's a #5 reason: if a plane is painted white you can immediatly spot if it has any oil leak!
*American Soldier:* Oil? Where!?
@@oneofmanyparadoxfans5447 aircraft usually operate using hydraulics. The leak could be anywhere.
@@thebigmacd That one flew right over your head.
@@oneofmanyparadoxfans5447 I missed the "American Soldier" part.
@@thebigmacd America. A country run by oil companies.
Great job sir. Thank you!
I wonder how basically all non-cargo military aircraft get away with painting their intake. I would say at supersonic speeds the friction alone heats up the entire aircraft, but they rarely see that. Only the F22 has supercruise. The A-10 doesn’t fly high enough to worry about icing, but most fighters can fly higher than most commercial airliners. I wonder if there’s some other kind of physics involved. Or maybe they just have a smaller hot oil line feed up to the lip, and get away with painting it.
Throwing the dollars at high spec paints or anodising would be my guess. Fighter jets also tend to have radically different intake geometry than a passenger jet, which might also make a difference.
@AZREDFERN The A10 can certainly fly high enough to encounter icing conditions.
Icing can take place at sea level.
Think 28 to 31F with fog or mist driving a car.
The A10 can fly at least 30,000 Ft.
@@karl0ssus1 Oh boy, you are spot on with that comment. The difference in intake geometry is HUGE!
Another great video mate.
I thought it had to do with heating the tips so that the engine doesn't ingest broken off ice or damage paint over time due to the heating.
The dog is so cute!!!
I'll save you 12 minutes. It isn't painted because the front edge is heated to prevent ice buildup, and they don't want the very expensive engines ingesting paint chips.
I watched the whole thing, your summary is incomplete.
@@stulop What part of the question posed does my summary not answer?
@@stargazer7644 the video contains much more than the answer to a question.
@@stulop I'd hope so, since it is 12 minutes long, but title of the video was a single question. If you want to know the answer without wasting 12 minutes, then there you go.
@@stargazer7644 it wasn't a waste, that's for sure, it never is.
A very clear answer - well done.
paulmurphy42 A good answer yes, clear, kind of maybe, it took 12 minutes afterall...
A question: What are those tiny wings mounted on the engine?
Photon thrust reversers.
Id say turbulence creators to unstick the airflow
You explain the subject superbly as always.
Many thanks
tones1957 (New Zealand)
I think your little dog already knew this stuff?? He's not at all interested.
Reason number 4 is visual inspection. Cracks are easier to detect visually if painted white.