The shower surround on our 89 Regal is just some sort of vinyl glued to a substrate. My guess is that eventually it would start to fail if water gets behind the vinyl. Old Blue had a complete fiberglass shower/bath but I'm not up to tearing out what we have. Any thoughts? Maybe fiberglass panels attached to the existing?

J

The big DIY stores have plastic shower surrounds that can be cut to size and installed with chalk and glue. Might find one that works for your regal. Most are 3 piece units. Install over the existing stuff!