This Sat. I found myself caught on top of a smooth rock pile with the waves going out from under me etc. 1 1/2ft seas. basically calm conditions. I put some nice deep scratches into the bottom glass that won't re-wet out.

Question or concern: I'm building a Sea Spirit S & G hybred and was going to try to use 4 oz. cloth throughout to make it light. After this Sat. I reafermed my belief in 6 oz. with an added 6 oz. football on the botom. I know many use 4 oz. and I'm convinced that it's a fals sense of security or for lake paddling only. If I had 4 oz. on my Outer Island, I would have been into the wood. I think it's cool to carry a super light boat on your shoulder down to the beach but to take a pounding on a rock, I just don't think 1 layer of 4 oz. will protect the hull at all.

I scratched up mine good and remember, - calm conditions, no real big waves - just laying on some smooth rocks and having to lift the hull with my hands to free myself.