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Mark _australia said..
I've tested my surfboard clear epoxy by putting it on a board in the sun. In the few junk boards I have laying around in the sun, after almost two years I forget which board and can't see it, so yeah its fine.
As an aside has anyone used Norglass nonslip powder? I want to know how it compares to Intergrip for particle size
I've used norglass powder and found the particle size varies and is inconsistent. There is to many big chunks in it. It's possible you could grind it down with a mortar and pestle maybe or sift it with something with fine mesh. I don't think you would like the finish as it comes straight out of the packaging. I have never used intergrip or any other acrylic powder, just the norglass a few times and then went back to UV stable and castor sugar as I can achieve a much more consistent and grippy finish that way, just more visible whereas the powder more factory like and almost invisible once you finish over it with clear P/U