the main problem that I have found is that if you use a polyester based product to fill deep voids, seams or holes, it will expand and contract at a different rate. it is not that it is not compatible, just that it will not expand and contract the same, therefore exposing the hole, seam void etc. you can skim over the top with rage(polyester based) as you are tying in the polyester gelcoat surface only. good luck, cheers, SRP
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