How to repair a crack in my shower floor?

I have a large, fiberglass / plastic shower in my basement. Several years ago it developed about a four inch hairline crack on the floor. My boyfriend drilled a small hole on the front side of it & tried to fill it up with some expanding foam & them applied some kinda like caulking on the crack itself and that part came off right away. So therefore the shower hasn't been used since. I just bought a package of PC -11 Marine Epoxy to put on the crack, hoping to seal it permanently.... Any help with knowledge on this would be truly appreciated. . Thank You So Much!

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