Ceiling spots

Date:2 May 2013 Tags:

Q: Can you help us with an annoying problem? We had a leaky roof that left water spots on the bedroom ceiling. We fixed the roof and repainted the ceiling, but the stains keep reappearing. And yes, we primed the ceiling first.

A: You can’t use just any old primer; you need to apply something that’s specifically labelled as a stain blocker or stain killer. Because you’re dealing with a water-based stain, don’t bother with a water-based primer. Use an alkyd- or shellac-based primer, as these won’t reactivate the stain.

-Roy Berendsohn and David Agrell

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