Ian, I had that problem with my second yak I built, which was 19 feet long, 19 inches wide, but a bigger cutout for the friend I made it for. So when the glass snuck up while I wasn't looking in several places at the 90 degree interface on a side and the 80 degree interface at the back in tow places, I sanded out the glass after the epoxy cured hard in one spot at the 80 degree angle, sanded to tight glass, then added some more glass. I did this because it was ligfted too high. The other area of the 80 interface about 7-8 inches away was just ever so slightly lifted. I scored that area and added epoxy to flood the gap, as I did to the side. After hard curing, I sanded smooth the entire interface and when building the coaming lip of maple strips, I would rub epoxy coatings to blend the area. Came out looking fine, and it's been some years now and all is still fine.
There's nothing wrong with sanding out and repairing with small band-aids of fiberglass, then fairing smooth. Over the years you're going to ding and dent the yak and such repairs become second nature. It's all good.

: Question(s): 1) Should I just sand down these parts and repair with small
: bits of fiberglass and epoxy ? I assume I would have to blend these in
: when they where dry.
: 2) Should I sand these down and then place a whole new layer of glass on ?
: Could someone then give me some hints to solve the problem with the tight
: curves around the combing ?

: I did think I could sand down then place a new layer of cloth with a whole
: cut in it to go over the vertical combing part. My only worry anout this
: is that when I come to squeegy off the resin, I have found that I end up
: pulling loose strands of glass from the weave and this ends up making a
: clump on the surface. Anyone with any ideas as to how to advoid this ?

: Thanks for the help
: Ian