Alright, I'm about fed up with this varnishing over epoxy!
I'm on my third day waiting for the Epiphanes clear varnish to cure over the West System epoxy on my WD H12. This same thing happen to 2 surfboards I made. I'm using fast hardener, several coats over the fiberglass. Usually about 3-4 days between epoxy coats. Sanded with 200 grit on final coat. Soaped done with Scotchbrite pad to get any blush off. Wiped down and let dry, then a thin coat of varnish, rolled and tipped. And I'm still waiting. Still tacky. Little progress.
What am I doing wrong? Last project this happened on, I waited a week, stripped varnish off, tried a different varnish, same result.