A friend loaned me a tube of windshield sealer that might do the
trick, if your top is black. This is the pro grade stuff used by auto
glass shops. It's sort of like RTV, but it dries (cures?) into this
really tough rubber that sticks to stuff extremely well. I used it to
patch some disintegrating door and window gaskets in my '78 Mercury.
I don't remember the name of it, but try a local glass shop.
You could use this stuff to glue a patch onto the inside, that holds
the edges of the tear together.
Stu
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