I’ve been trying to get a legit answer for that question for years, i understand why backrolling new drywall but I don’t understand backrolling a repaint
Basically the spray doesn’t really fully cover the wall deeply. It only surface paints the wall. The roller embeds the paint better to all the tiny cracked, etc. So why use a sprayer then, you might ask, well the sprayer puts the paint on the wall.
@@lexandersantana8089 For me the most important reason to back roll is if you need to do touchup. If you only spray you will have flashing from a brush mark or roller mark. Spraying , brushing, rolling all leave a different finish on the drywall or other substrate.
I'm going to have to disagree about having a reduced pressure from a smaller diameter hose. Given the same amount of fluid flow rate (paint) output from the actual airless paint sprayer unit, a smaller diameter hose will theoretically yield a higher output pressure than a hose with a larger diameter. Think about 1 gallon per minute of water coming out of a 2 inch diameter pipe versus 1 gallon per minute coming out of a 1/16 inch diameter pipe. Pressure on the 1/16 inch diameter pipe is immensely larger coming out of the smaller pipe. The actual volumetric flow rate is equal for both pipes, but in order for that same volume of water to come out of the 1/16 inch pipe as the 2 inch pipe, it has to have a huge pressure increase
Noah Krietsch that's not how fluid dynamics work. a larger diameter hose, with all things equal (interior smoothness, bends, length etc) will always have reduced friction loss over a distance. The fluid speed, which is what causes friction aginst the interior walls, exponentially increases with a smaller diameter hose to flow the same volume. Go swing by any fire department and they will gladly give you a real world example using 1.75 vs 2.5" hoses and the same nozzle size. it will take more PDP (pump discharge pressure) to overcome the flowing fluid pressure loss along the hose. At static pressures will equalize and the pump will be doing the same pressure output. but once things start flowing, the added velocity and increased turbulence requires more pressure at the pump discharge to overcome it.
From 6:40 to 6:55 spray is tailing when he sprays door !! lol
Pretty sure the operator has a tail too. Se hablao espanaol
Back roll primer and first coat, sand and then spray your finish and don't touch it
why would they recommend you back roll a spray finish I'm a Furniture finisher and I never backroll anything that would ruin the Finish
John Bergeron
I’ve been trying to get a legit answer for that question for years, i understand why backrolling new drywall but I don’t understand backrolling a repaint
Basically the spray doesn’t really fully cover the wall deeply. It only surface paints the wall. The roller embeds the paint better to all the tiny cracked, etc. So why use a sprayer then, you might ask, well the sprayer puts the paint on the wall.
@@Bbbbbbbbbbb-f1w I back brush or roll too so it's even. Exactly sprayer gets it on fast so you're not dippin all day.
@@lexandersantana8089 For me the most important reason to back roll is if you need to do touchup. If you only spray you will have flashing from a brush mark or roller mark.
Spraying , brushing, rolling all leave a different finish on the drywall or other substrate.
Buenos días
Que tipo de pintura Base y Terminado son la usan para el repinte de muebles de cocina y con cuál maquina. Gracias
Con que máquina y tipo de pintura para las paredes,. Gracias
\\%\
How TF did go to listening to music to this
I'm going to have to disagree about having a reduced pressure from a smaller diameter hose. Given the same amount of fluid flow rate (paint) output from the actual airless paint sprayer unit, a smaller diameter hose will theoretically yield a higher output pressure than a hose with a larger diameter. Think about 1 gallon per minute of water coming out of a 2 inch diameter pipe versus 1 gallon per minute coming out of a 1/16 inch diameter pipe. Pressure on the 1/16 inch diameter pipe is immensely larger coming out of the smaller pipe. The actual volumetric flow rate is equal for both pipes, but in order for that same volume of water to come out of the 1/16 inch pipe as the 2 inch pipe, it has to have a huge pressure increase
Noah Krietsch that's not how fluid dynamics work. a larger diameter hose, with all things equal (interior smoothness, bends, length etc) will always have reduced friction loss over a distance. The fluid speed, which is what causes friction aginst the interior walls, exponentially increases with a smaller diameter hose to flow the same volume.
Go swing by any fire department and they will gladly give you a real world example using 1.75 vs 2.5" hoses and the same nozzle size. it will take more PDP (pump discharge pressure) to overcome the flowing fluid pressure loss along the hose. At static pressures will equalize and the pump will be doing the same pressure output. but once things start flowing, the added velocity and increased turbulence requires more pressure at the pump discharge to overcome it.
Noah Krietsch )
Nope, that's not how fluid flow works.