Would primer cover these stains?

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Old 01-30-18, 11:55 PM
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Would primer cover these stains?

I have a skylight with wood frame that somehow stained the drywall. Would white primer cover the stains?
thanks!
 
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Old 01-31-18, 12:25 AM
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It would take an oil based primer like Kilz original or a white pigmented shellac like B-I-N.
 
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Old 01-31-18, 01:10 AM
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I'd be concerned about moisture leakage...
 
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Old 01-31-18, 04:00 AM
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I agree, a solvent based primer is the only way to insure the stains are sealed and won't bleed thru latex paint. As Vic pointed out moisture caused the stains and they are apt to return if that isn't rectified.
 
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Old 01-31-18, 11:54 AM
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First, keep in mind no primer is going to cover this nor should any primer be used as a top coat. It is paint which covers stains but you use an oil based primer (or shellac, as mentioned) to seal the stain so it does not bleed through the paint.
 
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Old 01-31-18, 03:19 PM
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A decent solvent based stain should for the most part cover those stains although that isn't the primer's main objective. If a little stain shows thru the primer it's no big deal. As long as primer is applied over all of the stains [no missed or extra thin spots] the paint will finish the job.
 
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Old 01-31-18, 06:10 PM
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Thanks for the replies!
I don't know what caused the damage but it's been there for many years and hasn't happened again, maybe the flashing on the skylights leaked and I think that was repaired at some point.
I was wondering, can I spot prime with shellac or oil based primer? When painted will the untreated areas look the same?
thanks!
 
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Old 02-01-18, 05:23 AM
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Yes you can spot prime although the main section shown looks like it should be primed corner to corner. Your finish paint will dry slower over the primed areas. If you applied enough finish paint those areas won't look right until fully dried which will take longer than the unprimed areas.
 
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Old 02-01-18, 11:37 AM
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In your case, I would say no, you cannot spot prime. Generally speaking, it can be done but your staining is too much of the surface for me to go that route.
 
 

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