Some individuals apply a wax coating over satin finishes on walls; however, they do not consider the level of difficulty this may bring once you decide to change the color on the wall. Whether you applied wax intentionally, or a candle splattered onto the wall surface, you need to remove the wax and smooth the wall before completing.
Apply degreaser over the wax on the surface. Apply a thick layer using an old rag. Allow the degreaser to set for five to 10 minutes.
Scrub wax off the surface using a scrub brush. Choose a plastic-bristle brush, as a metal wire brush may damage the surface. Work up and down, side to side, and in a circular motion to penetrate the wax from all directions.
Sand the surface with 80-grit sandpaper once the degreaser is dry. Remove any remaining wax from the surface. Wipe the surface clean with a damp rag.
Prime over the surface with a wall primer that is able to cover waxed surfaces. Use brands such as Kilz and Zinsser Bulls-Eye 1-2-3, which claim to cover small amounts of wax left on surfaces. Apply an even coating of primer over the entire surface using a paint roller. Allow primer to dry for two hours and apply a second coating.
Paint over the surface with wall paint. Roll an even layer of paint over the entire surface using a paint roller. Avoid leaving excess paint on the wall, as it can cause runs. Allow paint to dry for one to two hours and apply a second coat if necessary.