Repair a Crack on Plastic Shower Floor?

I need to know how and what type of material/compound, etc. to use when repairing a plastic material type shower. The bottom needs repair and I don't know what material or compound to use.

I don't want to discard the whole shower just because the bottom needs to be fixed. It's not fiberglass, but plastic, so I was told. Just by looking I can't tell. I do want to fix it so it will appear nice and clean and neat. The rest of the shower looks like brand new. This is in a double wide home.

Thanks for your help.

By Davy from Newport NC