Repairing Shower Surround Cracks

danrclem look closely at the paneling before using it. I don't think it is waterproof, more likely water resistant. Big difference, especially in a small area where it is likely to get wet with every shower and stay wet a while. I would stick with a tub surround type material. I have seen some that a flat sheets that you can cut to fit your situation. Fiberglass would be better but is heavier and would be hard to find the right size as you can't really cut it to size.