20 Transom Rebuild

[EBEACH]

EP, First off, let me say that I'm no expert, but I will try to offer some advice on what I've learned and researched.

Your seam should be tapered back from the cut line at about a ratio of 10-12 to 1. That is to say if the fiberglass that you're repairing is 1/4" thick, you should grind the glass outward from the cut line 3" (12 x 1/4 = 3") on a taper. You must use fiberglass for the repair. It is the glass that is giving you strength, not the resin. Too much resin can be a bad thing.

It's also best if you can do your lay-up in one shot, if attaching fiberglass to fiberglass. Once the resin has passed it's peak "exotherm" state, any bonding thereafter is mechanical and not chemical.