Using polyurethane over vinyl side art

You definately don't want to use Poly over your vinyl. If you did manage to get it on, without the sovlents eating the vinyl, eventual the rate of expansion difference between the two poly/vinyl will cause the poly to start cracking.

Looks like Prok has the perfect solution. Made just for you!
 
Vinyl cote sprays smooth as glass.. it's really made just for coating vinyl surfaces. Although even tho it's a great product for what it does, I can't really quite gather *why* you'd spray it on silkscreened arcade art. Not necessary.

Frog juice i'm also familiar with, but it's just a UV protectant of sorts, not a really long term durable coating. Lots of sign folks use it to help with the colorfastness of their prints in outdoor applications.
 
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