They have superior stain blocking abilities, and will keep any old stains from bleeding through to new paint. Oil-based primers are the best option for old walls. Plaster walls are more vulnerable to moisture than drywall, and require high-quality primers. What’s the best primer for plaster walls? Once the surface is roughly level, smooth the surface with high grit sandpapers to create a smooth surface for the primer coat. To do that, start by blending any patches or new plaster into the old plaster with rough grit sandpapers. The goal is to create a smooth, even surface with no visible cracks or holes. Larger holes from old bolts or longer cracks should be patched just like drywall and sanded. It remains flexible, so the crack will be less likely to reappear. Paintable caulk can be used to fill minor cracks. Plaster walls are unforgiving, and any cracks that are left alone will likely spread. This process can be tedious, but it’s one of the most important steps. Once you have the walls stripped down to bare plaster, you’ll need to repair and patch any cracks or old damage. Chemical Strippers – For paint that’s relatively intact.
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