On my Great Auk 14 I'm at the point of leveling the exterior prior to varnishing. In one spot on the bottom I noticed the fiberglass showed after sanding which I was not concerned about at the time. However, after applying a leveling coat of epoxy the glass did not disappear and it looks like there is some type of discoloring of the wood. Here is a picture.
Two questions: What has happened and what’s the best way to fix it?