Another poster is asking whether to use an acrylic or a tile shower
base, but I have a question about an already installed acrylic base --
at least I think it must be acrylic.

Can an acrylic base be recoated with some type of gel coat? Like, say,
a fiberglass boat can?

Our shower base is 20+ years old. It's holding up just fine and still
looks OK, but years of cleaning has got to be taking a toll. The glass
stall is fairly new so I wouldn't want to replace the whole thing in a
few years if I can avoid it.