How To Paint Unfinished, Discolored Drywall

By Rick Watson

We’re looking at a project where the drywall was installed 30 years ago but never finished. It is now brown. The new homeowner would like to finish the project. What would you recommend so we do not have bleed-through of this brown color?

First wash the walls with a good cleaner degreaser, as there is atmospheric residue that must be removed. Once that is dry, I would recommend a good stain-blocking primer like a synthetic shellac or a good acrylic-alkyd primer. If there were smoke-type stains, I would suggest a true shellac primer. This will help seal the cleaned surface from stains and odor. Then finish with a quality topcoat.

For more information about primers visit our product catalog.

Rick Watson, Product Information, Sherwin-Williams, answers reader questions in the Ask Your ProPartner™ column of PPC magazine. Read more of Rick’s answers to contractor questions here.

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Rick Watson, Product Information, Sherwin-Williams, writes the Ask Your ProPartner™ column in PPC magazine.