I just did my first round of sanding on the deck which I plan to varnish. I used 80 grit and it fairly uniform. My problem is there are some areas where I can see the weave of the fiberglass. Seems if I now go to 220, Ill get into the fiberglass for sure. Any suggestions? Should I do a light coat of epoxy now and then just hit it with 220 and be done?