I’m not sure how many epoxy manufacturers read Sways, but half the time of fast hardener for epoxy hot coats would be good IMO. As quick as a poly hot coat (cure time) which fast hardener isn’t in my 3.52.
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The faster the epixy hardener works, the faster it turns yellow. The clearest epoxies over time are the really slow working hardeners. And if you apply a final PU 2K Varnish, it will stay clear very long.