Q: I am currently working on a project that has old, untaped drywall that was never finished and has turned yellow. What is the proper procedure for texturing and finishing over drywall in this condition?

A: Myron Ferguson, a drywall contractor in Middle Grove, N.Y., and a presenter at JLC Live, responds: A few years ago, I taped and finished a cathedral ceiling that had remained untouched for a whole summer. The drywall had yellowed quite a bit, but I really didn’t think that it would be a problem. I taped the seams and primed the ceiling with...

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