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Dear Mike,
I can't figure out what your "cap" is. It's also not clear where the rivets attach to, since there's no way to tell where the crack is in the trailer.
I had a similar crack in our tub. It wasn't riveted, though. Repairing it took a bit of doing. First we filled the crack in with epoxy putty to provide reinforcement to the patch. Then I put a layer of epoxy, fibercloth and epoxy. I sanded this thing down and realized that I went into the fibercloth. So, did another layer of epoxy, fibercloth and more epoxy. Nick is probably right that it would be more inconspicuous on the back, but this wasn't an option for this repair. I sanded it down smooth, feathering it in with the old finish. Then I painted the whole tub with two layers of epoxy filler paint.
The result? The crack is gone, it is not noticeable at all. I am very pleased with that repair. Then there is rest of the tub--which was crazed with fine cracks. It did not take the epoxy paint well and the result is rather coarse in other parts of the tub. So, I'm going to have to sand it, epoxy the whole darn thing and sand it smooth again, and reapply the epoxy paint. Nevertheless, the whole thing looks nicer in a clean white, even if it's a rough finish in places.
I hope this helps you.
Mary
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