Originally Posted by transiberian
How do fix this? This is on a side of a hull
. Is the barrier coat and gel coat is the same thing? If not what barrier coat used for?
That appears to be cracking due to flexing of the hull against a hard interior
bulkhead or something similar. Putting some additional stringers on the inside of the hull to keep it from flexing so much would help.
You can also try redoing the area where the bulkhead or cabinet, or whatever is creating the hard spot on the inside, meets the hull to try and spread out the load so it doesn't bear on that one sharp point. There are several ways to do that, but it means removing and reinstalling the bulkhead, and that might make it too much of a hassle depending on where it is.
What you have in the pictures is gelcoat
. Barrier coat is applied below the waterline to keep water
out of the fiberglass
layers. Gellcoat is porous, so moisture will penetrate and encourage blisters
to form. The barrier coat is non-porous, so it helps keep it out.
Hope this helps.