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Varathane Spar Urethane Over Painted Wood

727 Views 4 Replies 3 Participants Last post by  RobD70
I painted cutout pieces for an outdoor sign I am making. I put a coat of primer and 2 coats of water based exterior paint on so far. I am planning to apply some Varathane Spar Urethane, clear water based for added protection. The can reccomends 4 coats, but thats on bare wood. Being that its painted, do I still need 4 coats or would like 2 work? Thanks
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It's about the same since if you ignore the water seal applied already, this question is moot.
Water seal may be combo of kinds of silicone and kinds of wax. Problem is it may not wash off, in the paint so to speak. If you apply water base or oil base clear seal, the seal may end up with spots (like water spots) or alligatoring.

If you must, try non amber shellac. Spray, not brush on. Alcohol in shellac will melt (smear) water based paint. Shellac may stick to water seal. No idea if it will work since shellac is weak to outside conditions, esp water. Vinegar wipe may remove silicone but also don't know what vinegar will do to acrylic paint. Search and ask further.
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