How do you fix a crack surrounded by the bottom of a (fiberglass?) shower? my husband installed a shower that had seperate peices for the...

my husband installed a shower that had seperate peices for the bottom and sides. afterwards we notice a big crack a few inches from the drain, if you stand on it water go through, we have children so it is impossible to prevent pressure on the crack, can we fix it short having to rupture everything apart? thanks.
Answers:    silicone caulking or they enjoy a fiberglass kit that you can purchase its a piece of fiberglass cloth next to a two step hardener that might do the trick