In building a Tango, I do some resin research from time to time. I found a boating link that discusses your issue. https://downeastboatforum.com/thread...tibility.1821/ . . . But none of the answers have a reference that go back any mfr's product data. I might ask West Systems about this. Or simply do a pull test on a sample coupon after it cures for 24 hours. Or for this one job maybe buy a polyester resin kit from an auto parts store. The important thing is to thoroughly scuff the base with 60-100 sandpaper. When in doubt, I always make a test coupon that I can test destructively. And I always save my mixing cups so I know the resin has properly hardened.