Primers

Anonymous Staff asked 3 years ago

What is the difference between interior and exterior primers?

2 Answers
MagicDave Staff answered 5 years ago

Generally speaking, exterior primers have a built-in moisture barrier where as interior primers do not… however there is much more in the way they are formulated… which only a paint chemist could explain…

For example Pigmented Shellac Sealer Primer is excellent for interiors and does provide a moisture barrier but does not hold up for exteriors…

Regular Latex interior primers do not provide any moisture barrier … the same is true for some interior oil primers…

It's best to use a product that qualifies as both and is oil based… Kilz makes one like this… along with Zinzer Cover Stain…

At last… read the product labels…

crowderpainting Staff answered 5 years ago

Exterior primers are more flexible than interior primers and have better binding resins. Generally, interior primers are harder but sand easy. Dave is right, go with a good universal primer (interior and exterior), can't go wrong with that combo.

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