The color you choose to paint a room in your home is the most important decision; however, the type of paint you choose is almost as important. You need to decide between painting your rooms with a flat (matte) or a satin paint. The difference between the two is a big one: flat paints have no sheen and consist of more pigmentation, which means you need to use fewer coats. Satin paints have a higher sheen and make small spaces appear larger. Once you decide what paint to use, you need to consider what type of paint is already on your walls -- flat or satin. If you decide to use flat paint over satin paint, you need to prepare your walls for the change.
Prep the walls you want to paint. Fill holes with spackling and smooth it with a putty knife, sand any rough spots and ensure the walls are clean. Even if the walls you are painting are interior walls, you need to run a damp wash cloth over the walls to remove any loose dirt or dust to ensure the best quality paint job.
Run light sandpaper over the satin finished walls prior to painting. This will help the paint and primer stick to the wall and increase the longevity of the paint.
Tape all trim and ceiling lines with painters tape to prevent your new paint from transferring onto surfaces where you don't want it.
Prime the walls before painting them. Pour white primer into your paint bucket/dish and run your paint roller or brush through it. Apply the primer to the walls. It's easier to use a small brush in corners and along trim and a roller to do the rest of the walls. Reapply brushes and rollers with paint when necessary.
Let the primer dry completely before you begin painting with your flat paint. Pour the paint into a bucket or dish and use a roller and paint brushes. Let the paint dry completely and apply a second coat as needed.