To paint an exterior wall, it is best to use a roller. You will paint from top to bottom, applying the undercoat over the entire surface. Use a brush to paint corners and areas not accessible with a roller.

Acrylic (water-based) wall paint is the best choice for outside walls. This kind of paint helps to make the wall waterproof, and at the same time it allows moisture that is already in the wall to evaporate to the outside.