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The crack filler is like a thinned epoxy, it works very well on HARD SURFACES and rotting wood. It isn't for leaking portlights. Basically, if you want a temporary kludge you can buy a toilet bowl seat (big beeswax donut) for about $4 and use the wax to seal the frames for now. Anything better will still leak again soon anyhow, at least thewax is cheap, easy to apply, easy to remove. (And you must clean it off to apply anything better later with the new portlights.)
You might be able to break the bond by hitting the frames with a torch (have an extinguisher on hand just in case). That will cause most sealants to break down and as long as you get them hot without overheating the fiberglass--that should do it. If the thought makes you uncomfortable--don't do it that way. A professional strength heat gun might also work for you.
I like the idea of using the Fein but of course that means buying tools.
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