When the epopxy is still green, I found using a cabinet scraper much easier than sanding for getting rid of drips. Once the epoxy is hard (after a day or two) the cabinet scraper doesn't work...

I am building a Pygmy Coho and have fiberglassed the outside of the hull
> and completed one fill coat. When I did these coats, however, I had a lot
> of bubbles come up and although popped them all with a foam brush, the
> outlines of the bubbles remained. I think perhaps these are called
> craters. These will likely fill in with my final coat of epoxy, but my
> first question is: should I use a Surform to knock down the edges of the
> "craters" before I do the final coat? I can't sand, of course,
> because there isn't enough epoxy on top of the fiberglass to do so without
> cutting into the cloth.

> I am going to wait to do the last fill coat until this evening when the
> temperature begins dropping in hopes this will prevent more bubbling in
> the last coat.

> Also, I put on a "sacrificial layer" of fiberglass tape along
> the keel with my first fill coat. It looks fine, but I had some trouble
> getting it to lay flat over the keel and had to paint on more epoxy than I
> think I maybe should have. It began dripping down the sides a bit and I
> kept it fairly clean, but there are a couple of drips that I missed. My
> second question is: should I worry about these drips now, or just do the
> final fill coat and hope it evens out? Or will it even out or is there
> going to be unevenness that will have to be sanded out before varnishing?
> Basically,when is the best time to address this problem?

> Finally, where the keel begins to curve up, there is air beneath the
> fiberglass tape that I should probably fill with epoxy. Should I drill a
> hole through it and do that now, or should I simply cut the tape back to a
> spot before the keel begins to curve up. I guess I don't need a
> "sacrificial layer" where the boat probably won't be hitting the
> beach anyway.

> Thanks for reading. Sorry such a long message. Pygmy not open today :)