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Well ya can try some J.B. Weld - Epoxy ....
Try some J.B. Weld .... Skim coat the bottom, a lil thicker inside - rough it up w/ some sand paper first.
If you do go the MEK route, make sure you are in a well ventilated area or you have a fume hood of some type. That stuff is not good for you to breathe in
It's a long shot, but maybe you can find a used tub from a shanty that has the material and/or hardware shot. -Jeff