Well, we have to fill every single hole or hollow that disfigures our “wanna be” ideal walls. Just remember to prime walls in advance any single drop of paint will land on our prepared surface. Thanks to a priming process we are able save an ocean of paint afterward cause it lets only once-coat layer. Moreover, a paint will have stronger adhesion. Yet another important thing, every time perform a painting process in a daylight! Unnatural light is not an ally in our struggle of having beautifly painted walls.