I am putting the finishing touches on a Return and had a question on the finish. I sanded the taped edges to feather them down which cuts into the glass of course so do i need to apply another coat of epoxy to this or can I just varnish it? If so if I use U.S. Composites fast hardner to do this how long do I wait to varnish Assuming a temperature of 60 degrees. Thanks for any advice Joe