Talked to Performance Cat about my nacra 450 cracks. See other posts. They said they'd do things about the same as Eric suggested, except using 2 layers of Knytex instead of 3 layers of cloth. They also said this was an uncommon problem. Long ago they did have an issue with this. Not when my boat was made. They figured the boat must have rammed something. When I got to looking closer, I did notice gelcoat cracking (crazing?) around both bow cracks. That's the pic here. I'll continue after uploading...