Ive used Deltas pit resin, in conjuction with their pit polish, and its works better than any others that I have seen, I just hand polish it, and it shines like glass, I did have a problem before with some repairs with other resins, when there are small tiny air bubble that you cant really see in the surface of the cured resin, almost like a pitted windshield, then you polish, only to see the resin staying in those small pits, it does like what you are talking about. Or maybe you didn't let the resin cure long enough.

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