primer issues. HELP !!!!

I started to prime the Duster this afternoon but had a major malfunction. I started with 2 coats of epoxy, waited 30 minutes (as per the tech sheet) and started to lay down the 2K (same manufacturer) First coat went fine. Second coat ended in disaster.


After laying down the second coat I noticed the the high build was shrinking and cracking on top of the Epoxy. I mixed the high build 4-1-1 as per the instruction. Im not sure if the problem was the temp was to cold, using the wrong reducer ( med for 65* to 75* , out side temp is probably right about 60*) or if I didnt wait long enough before spraying the High Build over the Epoxy.

The tech sheet said 30 minutes at 70* to apply primer over it (wet on wet)

No the million dollar question. Can I let the high build dry and just sand it off and re shoot or do I need to sand all the epoxy off again ?