Can you use polyurethane on top of paint? If not, is there paint seal
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couple of different websites for you to check out
http://homeguides.sfgate.com/can-waterbased-floor-polyurethane-used-over-paint-83471.html
http://homeguides.sfgate.com/use-polyurethane-over-latex-paint-34196.html
yes on acrylic/latex paint use a water base poly -- oil base will cause yellowing
use a non-yellowing poly acrylic
I have used it on top of craft paint on yard statutory. Works fine.
I always use at least three coats of a water based polyurethane on painted surfaces.
Are use water-based poly on top of my painted corn hole boards a good 6 to 8 coats as instuctions called for and it worked very well. No yellowing at all.
There are clear coat sealers in a spray for paint, at Lowes