I have put 2 coats of coating epoxy onto marine ply.

Then I applied one coat of Epifanes varnish 48 hours ago. The varnish is not drying.

Is there an incompatibility?

Should I wash the epoxy coating, as I have read elsewhere?

One professional adds cobalt drier to the varnish to fix the problem. Do you know about this?

I have only used a test piece of plywood so far. Also a narrow strip of pine (same problem).

Thanks