Todd:

I have no clue why your fiberglass tub/shower would be "peeling", and I have even less idea as to how to fix something like that.

But, believe it or not, the single biggest thing you need to do when painting a bathroom is to buy the RIGHT paint. That's because not all latex paints are equally resistant to moisture and humidity, and low priced paints will crack and peel under conditions of high humidity.

The advantage in buying a paint specifically made to be used in bathrooms is:

1. You're getting a binder resin that was chosen because of it's excellent resistance to moisture and humidity, so the bathroom will stay looking "newly painted" for a long time, and

2. Bathroom paints will have a powdered mildewcide added to them. This mildewcide is so highly soluble in water that even the high humidity on one side of the paint will cause the mildewcide to migrate through the paint film to the surface, where it will kill any mildew spores before they have a chance to grow.

I know of two paints specifically made for bathrooms. The first is Zinsser's "PermaWhite" available at Home Depot, and the second is simply called "Bath Paint" and is available at Sherwin Williams paint stores. I've been having a lot of problems with bubbles forming in Zinsser's Permawhite lately. I literally have to use an electric leaf blower to break the bubbles that form in that paint before it dries. So, in this post I'm gonna warn people away from Zinsser's and suggest you buy some Sherwin Williams Bath Paint.