The short answer is "Don't." But if you must, the best thing is to arm yourself with lowered expectations.
Fiberglass and acrylic shower stalls really are not meant to be painted. The beauty of these suckers is that they can be removed and replaced with... Well, not exactly with ease, but certainly easier than laboriously chipping out an entire tiled shower stall.
So, if you intend to paint a shower stall, start with the realization that this paint job is a stop-gap until proper replacement.
Key ingredients are:
- Those "realistic expectations" we mentioned.
- Epoxy-based paint.
- A paint sprayer machine.
- Sanding down the shower surface to dull it.
- Thorough cleaning.
- Venting the bathroom.
Image: Lasco Bathware