I’m getting close to finishing my Guillemot build after several years of work. I did a final sanding on the boat before varnishing and decided that I would not be satisfied with the coaming lip. I didn’t put a large enough radius on the fillet between the coaming lip and the riser so the outer layer of fiberglass pulled away from radius. I sanded through the glass in several areas and dust got underneath leaving large white areas. So I sanded more until the loose glass was removed. I then mixed up some epoxy and cedar dust and put a larger fillet. Today I sanded and sanded the radius smooth but found small white dots throughout the fillet. See pic below (the pic is upside down, vertical stripes are the rise, horizontal stripes are underside of coaming lip)
I’m not sure if these dots are due to air bubbles in the epoxy or have I not sanded far enough to totally level the surface? Any suggestions? I am really tired of hand sanding this tight area!