My mother in-law has a 1 yr old mobile home and in her master shower/bathtub it looks like she is getting what looks like checking on her shower walls. I don't know what the manufacturer installs for their shower walls but it looks to me like some kind of masonite covered with a plastic laminate. My question is: Can I repair this possibly with some kind of polyurathane or should I just go ahead and replace this stuff? I'm sure with this mobile home, if I take down the shower walls I'll probably end up having to replace the drywall or whatever they use. Any thoughts??

Thanks in advance

Dick Austin