rustmaster: I sealed the tank on my 37 about 8 years ago with the Por15 kit and it has held up very well. Do a search and read all about it. Some folks said it would crack but if you do your research on it and you'll find out why it won't crack and holds up very well.
As for it "eventualy failing"....well, most anything will fail over a long enough period of time....especially if it pertains to mechanical stuff. It will fail...eventually. I vote seal it.
