Plastic Shower Paint
Two coats are usually sufficient but a shower in poor shape may require three.
Plastic shower paint. Wear a dust mask to protect your lungs while sanding and painting. Scrub shower surfaces free of mildew and soap scum before you paint. Clean up brushes using isopropyl alcohol.
You need a different type of paint than you would use for wood or metal of course and many manufacturers supply relatively inexpensive two part epoxy paint specially formulated for plastic shower pans and bathtubs. Cover the floor and walls around the shower with plastic sheeting held in place with masking tape. Latex enamel in most cases a latex enamel will be sufficient for your bathroom and shower walls.
The glossier your paint is the better it will be at repelling water. Sand glossy painted surfaces to give it some teeth for the new paint. Use a paintbrush to apply the primer.
Choose a semi gloss or high gloss paint rather than a flat or eggshell. Inspect the surfaces after the paint has dried overnight. Re sand the fiberglass with 200 grit sandpaper to refine the surface.
Paint the plastic tub insert to create a new look for the bathroom. Tub and shower inserts are typically durable surfaces that can withstand a lot of abuse but they can become dingy or turn yellow over time especially if they are white. You only need to sand lightly to roughen the surface which will help the paint stick to the shower surround.
Clean it off with a tack cloth. Tape the plastic where it meets the base. Cover all surrounding areas of the shower with sheets of plastic to prevent paint from being sprayed onto sections other than the base.