You use an air compressor with an attachment to spray the compound on the wall.
Hog squash. You can apply it with a roller, however, it is easier and makes a better appearance if you use the air gun to spray it on. If you use a roller, the easier way to go is to get the powder texture. However, you must know that the majority of times when you apply with a roller you will get small points or peaks and they become a pain to paint.
Basically just follow the manufacturer's guidelines on the mix, you'll want about a pancake batter consistency, and just roll on.
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You take a solution of drywall mud and a texturizing tool and apply the mud very thinly in the desired design/texture that you are looking to get. There are a variety of tools available to do this job depending on the type of texture you want. This may be a job best left to a professional. Call some local drywall companies and get at least three estimates from qualified contractors.
If it is flat paint, you can apply the texture without any additional preparation. If it is a gloss or semigloss, you will need to rough up the surface with sandpaper first.
Either the paper face on the drywall had been damaged or exposed to the layer below or the wall had been previously wallpapered and it became unglued from the moisture in the texturing. New drywall, primed or not, should not wrinkle from exposure to texturing material.
Use a foam 100mm roller to apply paint. The go over with a good quality paint brush. the idea is to apply the paint evenly .
once you remove the wallpaper, you have to remove ALL of the adhesive. most painting stores will have adhesive remover. follow the directions, let every thing dry, make necessary repairs to the walls, spot prime repaired areas, than apply 2 coats of paint