To paint a fiberglass shower pan, remove the caulk, sand and scrub the pan, apply primer and paint, and apply caulk. You need a knife, protective gear, caulk remover, pliers, water, muriatic acid, a vacuum, a brush, rags, alcohol, sandpaper, masking tape, a paint sprayer, primer, epoxy paint and caulk.
- Remove the old caulk
Put on rubber gloves, and cover the old caulk with caulk remover. Break up the softened caulk with a utility knife, and remove it with needlenose pliers. Wipe up the caulk residue with a rag soaked in rubbing alcohol.
- Sand and scrub the fiberglass
Put on a breathing mask, and open the windows. Scrub the fiberglass with sandpaper until the surface looks dull. Vacuum the dust up with a wet-dry vacuum, and wipe the surface with a rag. Put on safety goggles and a respirator. Scrub the shower pan with several spoonfuls of muriatic acid diluted in a gallon of water. Rinse the fiberglass with water, and let it dry.
- Prime and paint the shower pan
Cover nearby surfaces with masking tape, and spray the shower pan with a thin coat of epoxy primer. Let the primer dry according to the manufacturer's instructions, and then spray on a coat of epoxy paint. Let the paint dry, and apply a second coat if desired. Wait 72 hours, and then remove the masking tape.
- Apply fungicidal caulk
Pipe fungicidal caulk around the perimeter of the shower pan.