Make sure you don't get any wax on the floor--that can create a slipping hazard. I've never tried waxing the shower, myself, so I don't know how well it works.
Shower tiles are glazed so they are already sealed. Waxing the shower will imbed dirt and soap film. So you will have a bigger job cleaning the wax and other gunk off the tiles. Best to just wipe the shower walls with a towel after using it.
I have heard that we should wash our tiles real good and dry them good and then put a coat of car wax on them to seal them. It's supposed to make them easier to clean too. I've heard of people doing it to a fiberglass shower too. I've never tried either but maybe you can find more info. on this site? Good luck.
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