If I let the epoxy cure (overnight in warm weather or more) then I usually wash the surface as I've had some problems with amine blush in the past.

Thanks for the info. A followup question in regards to amine blush, when people talk about washing their fiberglass, what does this mean? Also, what humidity level is considered too high to be doing epoxy work? I have what is called a non-blushing formulation, but I want to be on the safe side. Again, thanks for the help.