How To mix Plaster of Paris - For longer working time.
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- Опубліковано 2 жов 2024
- This method will give you longer working time with your plaster of paris before it hardens.
(Drywall mud does not work with this technique)
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Substitute about 1/8 cup of water for white distilled vinegar will extend the hardening process a good amount of time. The more vinegar, the longer u have to work with👍
Thank you thank you thank you ... So simple and so effective.
Well did what you showed on vid. Took 40 minutes to set. Worked great. Thanks. First time using plaster of Paris to make wolf copy from a original.
I originally started looking for info on what is stronger than plaster of paris. I find it cracks very easy when doing fine work that needs a wee file at the edges, but I need to use the fine work powder. However thanks for this, really enjoyed the video also thanks for all comments with more handy hints, this has been a great school day for an over 50. I usually leave the plaster to dry in the container and just crack off into the bin and the mixing utensils I immediately wipe with baby wipes or sorts and bin them. Back to my original search now.
Metakaolin clay with portland cement
I wish I had seen your video before I wasted 3 lbs of plaster of Paris trying to get it right! Thanks so much!
Me too. :)
Thanks for the tips. I did notice everything u said using the plaster.
Great tutorial. Thanks heaps for this. My first attempt to make fishing sinker mold was a disaster. This clarifies a lot . Thanks.
Thanks!! Glad I could help out!! Good luck with your sinkers!
Deryk
I watched your video. Thanks for the advice. Also I added 1 tsp of lemon juice per liter to slow the cure by about 20 minutes. This gave me time to vibrate any air bubbles out of my casting. I also put on rubber gloves and slowly mixed with my fingers. That way I could feel any clumps and press them through my fingers to get rid of them. It all turned out perfect.
Thank you so much! Cold water made all the difference!
Thank you for shoqing so clearly how to do the mixing process. I Just blew my asignment and was pretty diappointment. Now Thanks to you it will go right the next time
You are so welcome!
Awesome thank you to everyone that contributed :P
I don't understand why people want it thick . It can crack if it's thick you can trap air bubbles and it some times won't fill details . I know rocks sent that important but follow instructions runny is good air bubbles will rise you can stir it in the mould . It might be slightly longer to set but your video was about extending time . Just try it at 2:1
I put my mixing container in a larger container filled with ice. It keeps it very cold and it slows the cure rate significantly for me.
Couple of things I do. I put ice into the water while getting things together. I also use a little vinegar in the water and this holds up the curing process. I sift the plaster into the water and this seems to make it very easy to mix without bubbles. I have a box filled with kitty litter (we have a cat) and this molds to the bottom of the mold and keeps it level. I use a 16 X 20 photographer's tray for this (I just happen to be a retired photographer). I spent $5 on a bag of bark - separated it into good chunks - threw away the junk - spent $32 on latex and now have about 25 different molds to use.
I forgot to tell you all that this process can be used to make rocks on any scale. I especially like the "N" scale type rock faces that I use in the background for effect.
David Curtis I
Jolly good idea? May I borrow it?😊 I will definitely try this.
SO HELPFUL! "We're not making scrambled eggs"... This solved a mystery for me. My plaster mix hardened too fast for me to fix my wall cracks. THANK YOU!
I want to start making little stuff for the home bro
Can u do a video plz making a vase using the balloon? U can look it up on here. I need to see why mine won't harden bfor popping the balloon but it cracks inside the balloon.
Well done! I finally found a tutorial that provided the specifics I need to continue my project with enough confidence to expect a successful outcome. Thanks.
Thanks Bill! I'm very happy this video provided some help. Good luck with your projects!
~Deryk
Calcium sulfate is plaster of paris and setting type drywall compound. It hardens via hydration reaction
hydration of anhydrous calcium sulfate: EXOTHERMIC= gives off heat
CaSO4(s) + 2 H2O(g) CaSO4·2H2O(s)
Deryk , WHAM ! Poop , I thought I knew , but watched , to my suprise I didn't know anything , well maybe opening the bag of plaster . Thanks .
I have seen your Walters mine kit on other websites and each time I see it the better it looks . Now it is over the top of the chart LOL . Randy
Thank you very much. Marius. South Africa
This is the saturation method. Soak method used for figures place the plaster in a bowl first followed by carefully pouring the water in and leaving it to completely soak into the plaster. You only then give it a slow smooth stir. It creates a much more watery mix with less trapped air. I think it is better for molding. Worth a try.
I needed this entire video. You broke it down just like I need it. Thanks!
Glad it was helpful!
Adding one cup of milk will give you about 3 hours of lasting soft mud
Really????? I will have to try this. Do you need a full cup of milk and what kind - 2% - 1% ???
Hi David One litter of plaster and one tea cup [ full ] of any milk will do . [ I have no idea about the cold weather .]
The Lemons works as well but not as good as milk. You can try with Lemon powder
+Steve Steve I use 2 tablespoons of white vinegar to 2 cups of water and I get abut 40 minutes of working time until the plaster gets to the point that I can not work it any more. Plus I keep a gallon jug of water (drink a lot of ice water) in the refrigerator so I don't need to use ice anymore.
+Steve Steve I have used Gum Arabica ( dissolved in water)
Works very well and the casts are very hard too, not brittle.
Thanks! Just what I'm looking for!
have a box or pan with dried beans to place the molds in so they will set level
I need it to remain spreadable like frosting so I can smear it on a brick wall.
I did one cup of water and two cups of the plaster of Paris and it worked good it came out good I didn't know what to expect cuz it's the first time I'm doing it thanks for the video , but me using it is like so watery I like to dry mix already made.
Very helpful Deryk! I will defiantly use what I've learned. Thanks for sharing.
I wished I had watched this video before trying to make my tunnel liners as they turned out terrible but will give it another shot to day like you have shown here. I also found out best way to hold your rock molds is take old USPS box that you got in from ebay and cut the top out leaving all your pink peanuts inside and set your molds on top of them and they will support your molds while you pour your plaster into them, at leat they worked for me. Thanks for sharing Deryk!
Thanks David! Great idea with the USPS box. I will have to do that. Looks like we helped each other out!
This was very helpful! Thanks for sharing!
I have a carton of plaster of Paris it says not to creat a dust how do u do that
My first time bro
VINEGAR as mentioned by Danae is the solution. A little tiny bit of vinegar and problem solved! Why isn't anybody talking about it. It took me so long to find out and it is so simple. Set time extended a lot !
That was a great tutorial! Thank you! I learned a ton.. The instructions don't mention stirring slowly.
I'm so glad it helped you! I was new to making videos during this time. It's not my best work, hahaha.
Thanks again!
Deryk
Great tips Deryk, I've got some moulds on order so I'll be trying this soon!
Cheers Gregg.
Hi Derec! I don’t have words to thank you for these tips! You have literally made my life easy! I have been working with plaster for quite sometime and always had this issue of plaster drying too quickly, today I followed you and Oh my GOD! I am flabbergasted! Thanks a milllioooonnnn timmmessssss ♥️♥️♥️ God bless you!!!!
Great to hear!
Putting your mold in sand gives it some support.
Kitty liter works well to.
+MaddyHatesMath Thanks! You are absolutely correct.
I never put my mold in sand, in fact i bleach out the mold so it doesnt spread in the sand! The black mold is the worse and using a strong bleach solution will help!
Next ti e you put ypur mold in sand be very cautious, the sporex of tbe mold can spread!!! Lmfao!!!!!
awesome "how to" deryk.. thanks for sharing
vinny
I tried this to help make the plaster stay workable for longer but the cold does not help plaster hardens by chemical reaction use citric acid to make it workable for longer it actually works :) chemistry is the key :)
Cold water works for me.
ALSO 1 TSP OF WHITE VINEGAR PER FULL CUP OF WATER SLOWS THE CURING TIME A LOT. TO MUCH WILL REALLY SCREW UP THE MIX. SPEAKING FROM EXPERIENCE ANAIN.
I'm not quite understanding - why spend 10 minutes to mix it for longer working time if it's going to take 30 seconds to pour it into a mold? I use plaster of paris to make chalk paint and it does a great job. I plan on making rock mold with tin foil and p of p. But Good job on the vid, and thanks for not playing any of that crappy music that alot of videos include. Have a great 2020!!
That's a valid question, sometimes hobbyists use it for making mountains and "painting" it on, instead of just molds.
I was way off. Thank you, Sir!
You are very welcome!
It is not trued that it doesn't start to cure until you stir - it begins as soon as the components touch each other, it just happens faster when you stir.
Helpful, thanks. 👍
Thank you so much for this tutorial. I was doing it backwards. Couldn't figure out why it was hardening. Now I know
Hey Derick, I found a train in a plastic bag when cleaning a commercial Parking lot. The parking lot had a small wooded area. I was picking up trash that people had been dumping. When I grab the plastic bag it was buried in the ground. I uncovered it and it was a whole train set. I’m sure it not the kind your looking for LOL! Anyway just wanted to share. Also is there a need for something like that? I guess what I’m trying to say is is it worth spending time cleaning, painting and trying to sale it or do I give it to someone like you who enjoys trains?
Hi, Sheri! The only way it will be worth anything at all, is if it's a sought after, Lionel train. And if it is...you most certainly DON'T want to repaint it. That will destroy the value.
I wanna thank you thank god for people like you who teach sheesh i really screwed up my project i mixed it and went to the bathroom when i came back it was hard like seament
and you might want to wear a mask when handling Plaster of Paris in its dry state good tip!
+Hilary Bravo WHY?????????
+David Curtis so you don't die from lung cancer. any particulate, any dust you breathe into your lungs can stay there...and cause problems such as emphysema or cancer...don't breathe dust breathe air...
LOL - I JUST GOT A CONTAINER OF PLASTER OF PARIS AND WILL BE TRYING THIS TOMORROW
It's my opinion, those that don't learn how to do something right the first time, "because it's so easy", end up learning the hard way about their errors! (That's why I did the search I did!) Thank you Sir!
Well said! And thank you very much. This is an old video and my video techniques have improved since then. But it still gets the point across.
Simple enough procedure, yet with sound techniques that build up a good demonstration for extending the working time of plaster. Thank you. I've been working with the brand Fixall, for casting small rocks for dioramas, but now have the need to fashion a dog animal in the "O" scale for a current build, and have not seen anything pre-packaged that's suitable, yet. Hence the thought that maybe I can carve one out of wood or plaster. Again, thanks for your clip.
Can u use this for hand prints my kids ask me
I'm really not sure.
I've been using this now for a while. I repair drywall with it and it works fantastic as a prefill for larger joints or holes. I mix it gently but I need a consistency that will stick to a drywall knife to put on ceilings. I've skimmed out patches with this stuff. It takes practice to get used to using this. I used to use a floor patch but this stuff really sets up and gets good and hard. I've used the easy 20 and it takes an hour or more to dry. 20 min is working time. In contrast the plaster working time is about 3 or 4 min.
Excellent video the big thing i really didn't think about is not putting it down your sink / drain system. If i didn't see this i might have not thought of this. That was major key element always wash it out side thanks for that one :)
Great video ‼💯
Thanks 💯
this is so useful, thank youu!! i let u know if turns out great hehe
Do you have any ideas how to add latex paint into the plaster and then pour it?
Add the paint to the water first and then follow this procedure
Have you used Plaster Wall Patch? They say that takes 2 hours to set. Is that true? Are there downsides to using Plaster Wall Patch?
I'm not using plaster with molds but rather for patching flaked off skim coats and layers of plaster on walls.
I have no idea, never used the stuff, or ever did what you are doing.
Thank you for this video, I have wasted some much plaster. Wishing I had found this faster.
Question: what was the spray bottle for?
It is a mixture of water with at drop of dish soap in it. Use it to spray your molds before you pour your mixture into them. This makes it easier to remove you plaster casting after it dries.
Been using hydrolcal for 35 years tried plaster of Paris in high school but just can't beat hydrolcal
+Chad Peterson Hydrocal is great. Used it 30 years ago when I started casting but lost the supplier for bulk and it just costs to much in the small cartons you get at the hobby store.
Whip it, whip it good!!!
2- drops of photo flow for a wetting agent that i seen on a model rail road video.
I will have to try that. thanks!
wow thanks for that, but ya never showed us what you made, ahhh. and thanks to the guy that said add vinigar.
My word I need to send you a gift to say thanks for this great video! You have saved my bacon for sure so THANK you Sir very much! Great great tip!
Do you think you could add another layer without it cracking off? I am making large sheets on burlap to do paintings on. It's hard to get it thick enough with the first pass of palaster.
+Carol MacConnell - I'm really not sure Carol, I've only ever used it in molds.
If you wet the first layer you can add as much as you want.
Thank you - novice at working with PoP so this was very useful.
I used oil and some time glue but it doesn't stop quick harder
I’m going to make a box framed mirror with oyster shells placed in plaster where the plaster shows around the shells! Any advice!
That is out of my area of expertise. Sorry I can't help you with that.
Hi. Thanks for the video. I substitute interior paint for water and it gives me 20-30 mins working time. For 2-3 hours working time I add D19.
I need help-a diy formula for artexing an interiority Wall.
Good video. I wasted a 25kg bag of the stuff as I was mixing it with a drill and paddle like you would with normal plaster :(
leeeeeeeeeds Thanks! I hope I provided some useful tips.
leeeeeeeeed
Thank you so much! Just curious, how strong is plaster of paris? Does it break easily and if it does, how would i strengthen it?
Yes it does break easily. I'm not sure how to strengthen it, I've never tried.
@@DGModelworks thank you so much for the reply!
You can add white glue.
Question. I use just starting using Plaster of Paris to cast smaller molds that I use to build Dungeons and Dragons terrains/structures. Even after roughly 30 minutes, as I'm trying to demold, the pieces are brittle and will break easily if I'm not careful. Should I wait longer? Maybe my proportions aren't right.
Let them dry longer. That should fix your problem. Good luck!
Thanks I was adding water to the plaster and it was just a lumpy mess thank you
Can we add vinegar if we are making pop craft
sorry but this tecnic is way way too long...use the Donut method X 10 times faster just has good...
Very helpful.... Thank you 💕
Why the water have to be cold?
Fantastic video! Thank you so much for the tips. I'm also a bit new to working with plaster, but I'll definitely keep this in mind. Thanks again!
Thank you Angel! I hope I could give you some good tips!
Deryk
14:36 😲😬💀 I wish I would have watched the whole video 😏
Wasted 10kg today. Thank you for the video.
tHANK YOUUUUU
i used plasture of paris i put it in a mould but when i take it out....there where cracks in it and when i hold it up it suddenly broke .. ehat should i do to avoid these cracks???
my brother, dad and I put our hand prints in concrete at our old house back in 2001 when he extended the driveway. i want to make a plaster mold of them since i cant take a piece of concrete slab of course. DG Modelworks, you may not see this but by chance if you do; what are some tips or pointers of making a mold from concrete.
At that time i was 6 and my brother was 9. it was a good memory of us.
I'll be honest, I have no experience making molds. I hope you can find some info on it though. That would be cool.
Unrelated ,,,What are your plans for the original layout ? As you stated , the turns are too tight for your larger locos and your new layout ideas have changed . Have you considered tearing down the old section and rebuild it with larger curvs and more switching ?
Randy
Sooooo, if I rinsed my bowl out in the sink. What should I do before! It stops up?
Marian Latimer let it dry and scrape it out before you final wash in sink, with lots of soap.
Nice video! I am a bit of an impatient person so i just poor, add water and stir :P then RUN to the layout lol I just do small amounts, and add more water / stir and just do it in parts so I can see how things are looking as I go. But I i have found that the dried up plaster at the bottom of the bowl, breaks up nicely into rocks. Woodland Scenics has a video where they pour plaster into a bowl, add water and let i soak down for a few minutes, then stir before use.
Thanks Nick! While there are many ways to mix plaster of paris, I found this way worked best for me. I say do whatever works for you.
Deryk
Hey, just wanted to ask if 'Pottery Plaster' is the same as plaster of paris. the instructions on the packaging say exactly the same thing as you're saying and is what I did but it is hardening quickly anyway! Please help!
turkey tray with oil dry or kitty litter , i spilled a few molds lately lmao, a big mess
5:54 amen to that. How does room temperature affect it? I live in hot humid country but usually have the AC on (which also dries the air). I'm not experienced enough yet to know if best keep windows open and let in the hit humid air or turn on AC hard before I do this.
I'm really not sure.
Thanks for posting and your right this is a mess to work with. I am desperately trying to make a project and it either too thin and cracks or gets too hard to work with. Im thinking about using flour and water and calling it a DAY!
what will happen if you mix quick create sand plaster of paris and water how fast would it cure and would it be hard to break and how heat resistant
DeadEye MC I have no idea. Never mixed that before. The purpose of this video was Plaster of Paris only.
How do you remove plaster of Paris is there anyway to make it wet again
Thank. You.. appreciate the info..
I have a question for dglass77. Can I use this plaster of paris using my "Latex rubber mold" ? If so what can I use for an agent so it does not stick to it? I currently make angel molds using "cement". I make my own cement to. Thanks.
I spray my rubber molds with a water/dish soap mixture (1 or 2 drops of dish soap in a spray bottle of water) before I pour my mixture. I have no experience with latex molds.
kindly reply, how can i apply plaster of paris to a styrofoam board? I can't apply it evenly.
I don't know. This video was on making rock.molds.
+DG Modelworks well I was just wondering since you know how to mold rocks maybe you know how to apply some 😅 thanks btw. I just need to make a new layer and smooth layer for the styrofoam because I can't start to make a diorama. We don't have the foam board you use here that's why it's hard.
+Kelly Concepcion No problem. I've only used the plaster to make rocks. And then I attached them using globs of sculptamold. I never used the plaster to make a smooth surface like you are looking to do.
+DG Modelworks aight thank you so much :)
use spackle in a bucket. takes longer to dry but its great.
On WoodPrix you can find excellent plans for woodworking.
Thank you for reminding me not to rinse/wash that batter mixture into my sink,!
Good info thanks. Have you tried using concrete adhesive to your water mix?
First time I tried mixing plaster of paris it ended in disaster. That's what brought me to your video. I then watched your video during my second attempt...success. Thank you so much for your video.
Thanks so much for the kind comment! I am so glad I could help you out! I also got frustrated mixing plaster of paris till I found this method. Now I am not intimidated to do it anymore. Enjoy your new found talent!
Deryk
You can learn more about it on woodprix website I think.
Great thanks. Dos it turn out the moulds ok without breaking 👌
Yes it does