Brick walls usually do not require any surface treatment, and are best left unpainted. If you do paint the bricks, there is a clear risk of frost damage if you live in a temperate area. If, however, you decide to paint your bricks, we recommend that you first apply a coat of slurry plaster to even out the surface and to minimize the joints. Thereafter prime the wall with Colorex Betoprime, followed by Colorex Betopaint for a nice and durable surface.