[3goats]

We used a 2 part epoxy made by Dominion Sure Seal . It is blue in colour and we used the adhesion promoter. The stuff sticks like glue to the endura and did not crack when flexed. We then sprayed Pro Form 2k epoxy primer only. 3 coates and blocked. Did not use any flex agents at all. Booth temp was 70 deg or so if that matters.
I was told by a very reputable bodyshop guy from py here that we didn't need flex additives at all.
I think it has something to do with the primer but don't know. I can't buy the SPI epoxy here which was suggested to me. Should we sand the epoxy and try flex with ppg 2k? Or try a different epoxy primer?