It happens far too often. Different solvents interreact, or paint
isn't completely cured before application of a topcoat, etc. It's best
to avoid that.
Use a high-quality exterior enamel instead, Paul. No extra protection
or gloss needed. Someone recently mentioned Benjamin Moore Impervex
and got a rise out of me. My mind centered on the middle of the word.
:) It comes in acrylic (waterborne) and alkyd (solvent) bases.
The ultimate result of shielding men from the
effects of folly is to fill the world with fools.
It will if the paint is lacquer-based, like Krylon or other
fast dry spray paint (look for acetone, ketone, MEK, or
toluene in the solvents listing). Do a test first. If a lacquer
topcoat is incompatible with the base paint, it'll tell you in no
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