I'm now in a point where final sanding is more or less done and in some places I have reached glass fibers too (edges of overlaps and reinforcement patches). Should I seal these areas with epoxy before applying varnish? I'm worried, that the glass matrix will be visible under the varnish unless it isn't surrounded with epoxy. This is my first boat to build and the finish will be far from perfect anyway. So if the effect is minuscule, then it won't really matter. I'm using a natural oil based boat varnish (Le Tonkinois).