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Next, apply a coat of primer. For colours that are not white, you might want to use tinted primer that is as close to the colour you want to paint as possible. When venetian plaster has been used on a wall, you will need to find out if the plaster had wax or not. If it did, you need to remove it otherwise the primer will not adhere to the surface well. How do you do this? Dab some paint thinner onto a rag and wipe the wall gently.

To avoid peeling that may result from moisture underneath the paint, you need to make sure the wall is completely dry before you proceed to apply the primer. Give any spots on the surface that are moist adequate time to dry completely. As you get rid of moisture, also make sure you remove efflorescence. Efflorescence is the white powdery film that appears more clearly on darker concrete walls which is the result of minerals in the concrete rising to the surface. Using rough burlap or a plastic-bristled scrub brush, rub the white crystals off until they are completely gone.

Should the wall have been painted on before, you will need to wash it with a sugar soap solution and then go over it with medium-grit sandpaper. From this point, all that is left is for you to apply a coat of primer and begin painting. However, note that if oil-base paint was used, you will need to do the priming with alkali-resistant primer.