Joints and screw heads often show up even under three coats of joint compound because drywall’s paper face and the compound have different porosities and so reflect light differently. Rather than skim coating the walls, a faster and less expensive solution is to use a drywall primer/surfacer. Pro painter Philip Hansell thoroughly explains the two types of primer/surfacers and outlines their respective pros and cons. He also describes how to get the best results from these products.
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