Bumps in old paint?


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Old 03-19-18, 04:28 PM
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Bumps in old paint?

Does anyone know what causes this? They are little bumps and there are quite a lot. It doesn't look like a paint drip. They are on both walls and ceilings.
Thanks
 
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Old 03-19-18, 04:43 PM
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Imperfections on the wall, dust, contaminates, etc can cause paint to blister while wet and dry that way. You should always pole sand (or hand sand) walls prior to rolling them to remove these sort of imperfections. If you paint over an imperfection, it gets bigger and bigger. Roller lint can be a bad one if you use cheap roller covers.
 
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Old 03-19-18, 07:23 PM
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ok, thanks. I'll sand them down before painting.
 
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Old 03-20-18, 02:46 AM
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The most common cause is trash in the paint - either from old paint that wasn't strained first or junk that was picked up by the roller. Contaminants on the wall can also cause it, either way the fix is the same.
 
 

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