HELP! After my second coat of varnish (z-spar captains)air bubbles have appeared.I wet sanded inbetween coats with 400 grit.The boat is epoxied with west system epoxy that has been cured for 2 weeks.I used a new badger hair brush for the application of the varnish.This is the same way I varnished a kayak I built last year but had much better success. Could it be bad varnish or too hot 80/90 degrees F. TIA Don