You bought Sherwin Williams flat paint and decided to change to a satin finish is there something to add to the flat paint to change it to a satin finish?
Yes, you can. The whole problem with flat paint over satin is the gloss sheen bleeding through the flat finish. I typically do one of two things for a customer when they have this situation: Either I just plan on two coats of the new paint, or I paint the walls with cheap flat white paint and then paint the top coat with the new paint. I prefer the latter, as I always have buckets…
Satin is lower gloss than semi-gloss paint. Paint finishes in order of decreasing gloss are: * Gloss * Semi-gloss * Satin/Low sheen * Flat Some manufacturers call Satin/Low sheen finish Eggshell, and others regard this as a finish between Satin/Low sheen and Flat paint. The higher the gloss finish the easier it is to clean, the higher its durabillity and the more it shows surface imperfections.
It really is up to personal preference. Most commonly flat paint is used. Flat paint hides drywall imperfections, has no sheen associated with it and is usually easier to blend in and touchup. With satin paint you can see more imperfections which is also easier to see when you have large open ceilings. It really is up to the individual but flat is used most commonly.