I stored my kayak for the winter this past September, and sometime around Christmas, I noticed the fiberglass delamination shown in the attached pictures. Some of it was present on my last couple of paddling excursions last year, but the areas have drastically increased in size since.

How to fix? What could have caused it?

I don't think that I used the most pristine methods of keeping my mixing cups clean, didn't scrub a whole ton of blush, but why in these localized areas? The fact that the delam goes across my hatch rim (see next post for highlighted pictures) leads me to believe that it was some kind of localized contamination. I wonder if I leaned up against the hull (pre-glassed) with my forearm and left a greasy, sweaty spot? I wiped w/ acetone before glassing, but maybe I didn't wipe enough?

I had small spots like this just after glassing, but they were always small - 2 to 3" in diameter. I filled these w/ epoxy using a syringe. I'm not sure how to fix these much larger spots. The top one is about 1' x 4". The bottom one is about 3" dia. on the hatch, and 8" x 3" on the hull next to it.

Any help would be greatly appreciated!