Preparing raw plaster walls for painting requires laying down a tinted primer before applying the final coat, but Venetian plaster walls need to be wiped down with paint thinner to remove the wax surface. Prep a plaster wall before painting it with helpful tips from a professional artist in this free video on painting techniques.
How to paint over plaster. Unless your house is really old, you most likely don't have any plaster walls in your home. If it is old, then you do have the luxury of having plaster walls, which were done many, many years ago -- we've since gone onto drywall -- and you want to paint over your plaster. It's probably been painted already, many, many times. If it's raw plaster, you'll need to prime it with a primer, or you can tint your primer, which is one of my favorite things to do, especially if you're painting red or something. Get that primer tinted as close to the color as you want, and then use your paints and paint over the prime, then you'll be done with painting your plaster. These days you're going to hear about Venetian Plaster. If you're going to paint over Venetian Plaster, the first thing to find out, hopefully, is whether it's been waxed or not, the surface that you're dealing with. In this case, right here on this wall, since I know who did it, I know it has wax on it, and I also know it's not water-based wax -- it's a carnauba, which is a petroleum-based wax. I guess I just like oils. That has to be removed, because most paints, primers, anything, are not really going to stick well. You might kind of wing it, but it's safer to use some paint thinner on a rag, and wipe off the walls as much as you can to remove that petroleum-based wax first. Then, we would prime it, prime it with a water-based primer, which is OK, and paint over your plaster as you would the plaster from the old time days.
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