The new surface will be porous and will absorb the color of the paint. Primers will also cover the joint compound and provide a good base for texturing or painting over skim-coated drywall. Then again, you won't need to prime if you choose a paint & primer in one – although separate products are always best.

Can you paint a wall too many times? No, there isn't a limit to how many times you can paint your wall. Keep in mind that it's important to sand the previously painted surface somewhat prior to repainting. Can you paint over a painted wall?

The 24-hour drying time recommendation can be applied to nearly all factors. Some manufacturers will bring down that number to 12 hours if a few shortcuts are applied to help speed up drying time without affecting the finished product. Filled-in screw holes and minor indentations can take about 2 hours to dry.