Hi Bill,

I've recently used 6min and 30min epoxies branded as Tower Hobbies Build-it, ZPoxy brand finishing epoxy, and NHP Brand 12 min epoxy. All have worked pretty well even though I mix 95% on a piece of wax paper. That said, the NHP brand stuff does seem to set up much harder. In a few days they all seem the same.

When you get a "soft pour" where it seems to remain flexible or rubbery its usually the result of too much hardener. The only time this seems to happen to me is when I mix a large batch in a plastic cup where it is difficult to get precisely 50/50. When I mix on a piece of wax paper I can more closely eyeball the two puddle sizes before swirling them together.

Hope this is helpful,

Clay