: I would sand those bubbles out and patch the sanded area with a layer of
: fiberglass that extends at least an inch past the boarders of the sanded
: area. I would also wet out the area beyond the patch to protect the
: "good" surface from being sanded too much when you go to smooth
: out the patch's boarder. Good luck.

Another option, that would create far less glass and epoxy dust, would be to simply cut (carefully) around the edges of the patch area , then peel back the old glass, using a heat gun to soften the epoxy. You still have to sand some, to feather the cut edges, but not as much as sanding the whole area. Then put on a local patch, let cure, feather smooth again, and put on your final glass layer for abrasion protection.