: The edges of the inside seam of my Guillemot have a rough ridge which could
: cause damage to gear, floatbags, etc.
: Any ideas for smoothing it out, especially towards the ends where it is hard
: to reach?

Really coarse sand paper (36 grit) would probably due the job. Tape it to a foam block and attach the block to the end of a stick. You could also paint on a little more epoxy. Is it really that rough. I have not had any problem with the tape puncturing dry bags.