Unpainted wood and drywall can pose huge adherence problems for coatings without primer. With fresh drywall, the substrate actually absorbs a coating really well, like a sponge. However, because it absorbs so well, without a primer coat, you'll experience uneven coverage, especially along drywall seams.

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.

Primers act as a seal, which won't only block out paint penetration into the drywall but cover small flaws too. Although drywall repair is a must before painting for the best possible results, tiny blemishes are easily covered with the primer.