I need to do some interior painting and thought that I had plenty of primer. I noticed that the 5 gallon pails that I had were labeled exterior – I am doing interior painting. My question is – what is the difference between interior and exterior primer. Can one use a paint rated for exterior on interior surfaces? I would suspect that additives in the exterior paint raise the price somewhat but do not impact is use for interior purposes. (in this case the primer is a latex base)
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In general, exterior primers and paints are formulated to allow greater expansion and contraction, as would happen outside versus in.
Other than that, have at it.
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I can't answer directly, but some outdoor primers (and paints) had (and possibly still have) extra additives to combat mold and mildew. Some of these additives can be unwelcome in an interior environment. All paint makers have a free telephone contact line; you would do well to call them.
Edited 4/23/2007 1:02 pm by JohnD1
Exterior primers cure slightly softer to allow for expansion and contraction, but some don't wear quite as well.
I also notice that they tend to be a bit "furry" needing more fine sanding between primer and finish coat.
But they will do the job
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