Are you sure you got your JB mix 50/50, if you did not get the hardner equal, it will not hardenI have question that has nothing to do with any of our craziness. I have used J. B. Weld to repair a crack in our shower. One spot, half size of a dime, did not harden. Googled it, and all posts lean toward applying heat to force setup.(been setup for 24 hrs)When I put heat to the jb weld, it melted. Any suggestions other than ripping out the shower and building a walkin shower with glass and tile.
A hair drier is about all the heat you need on JB
We use a product called Marine Tex, it is a 2 part epoxy also,
I,ll get you the name of another sealer called 5200, its a marine sealer, the very best
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