Re: 20 Transom Rebuild
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.
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