If you are not in the painting service business, you will find that taking a brush and adding layers of color on the wall is not how you paint walls. As a matter of fact, when it comes to drywall, you need to pay attention. Why? Because drywall is no plaster. Even if your drywall is rather thick, it might have some cracks here and there. There is no point of covering imperfections or problems with color. Let alone that it is absorbent.
