Using all same materials I have been for years. Eps blank. Epoxy resin. I have been experiencing a lot of burn through when installing fin boxes and repairing busted boxes. Doing the 2-1 ratio. Used kwik kick today. Had same issue. Any advice?

I think you're talking about resin exotherm melting the foam. "Burn through" is a term we use when oversanding the hotcoat into the glass.
In summertime heat (80 degrees ) the epoxy resin will tend to exotherm in deep holes as in FCS X-2 plug holes and ding repairs. FCS fusion, FCS II, and Futures are a tight fit and use very little resin so no worries there.
We recommend pouring only about a 1/2 ounce of epoxy into a hole at a time then waiting about an hour to fill up the rest of the hole. This will stop the epoxy from exotherming and melting EPS. 
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