I am sanding the epoxy in preparation for varnish and am getting tiny white dots appearing. I think it is tiny tiny air pockets in the epoxy and the white is the sanding dust. I am concerned about sanding into/through the glass but do not want to leave the dots. I have tried to remove them, tack rag did not work, vacuum had some success.
wondering if anyone else has run into this and thoughts on how to best solve.