Oops, sent that a bit too soon.

The question is: how to clean up these messes.

   Dremel tool w/ a small cutting bit to cut the large bubbles away.  Sand the edges to taper and laminate a patch into it, making sure to press out any air. On the stem, any patch should be done w/ cloth on the bias so it lies better over the angle of the stem.  For the raggedy edges, a sharp razor blade knife and steady hand to clean up the edge and remove the bigger scrap bits with a little heat from a hair dryer and a sharp scraper or chisel, very flat to the surface.  You should be able to separate the epoxy/fiberglass from the wood that way w/o damaging the wood, especially if it's only been a day or so.  The small bubbles at the edge, I might just open up and go back over w/ more epoxy to fill them. If you are painting, you can mix some thickener in to give it body enough to fill the little holes but not dribble/sag out (I bought the microspheres fairing compound...kind of purple, but I was painting anyway).  If you want clear varnished finish, you might need a couple of thin coats so it doesn't dribble.

 And maybe, get a magazine and chair and read a bit sitting by the boat, checking every couple pages and cleaning up sags.  The neat epoxy has a habit of continuing to run when you think it is all done with that.   I had some of the same things, just not quite so much, and recovered.