Fiberglass pools can become dull and faded over time and need to be resurfaced. Fiberglass pools are painted with gel coat, which is a fiberglass resin that is pigmented to match any color. Gel coat has additives in it that protect from ultraviolet rays. With the right application, gel coat will last many years. All fiberglass and gel coat materials can be found at your local marine supply store.
Use a scrub brush and a gel coat cleaning solution to remove all of the dirt and buildup from the pool surface. Let the pool dry.
Put on a respirator, and sand the entire surface of the pool using 200-grit sandpaper on an electric sander. Scuff the old gel coat until there is no shine left and the entire surface is dull and smooth.
Remove all of the dust out of the pool using a wet/dry vacuum.
Use rags and acetone over the surface to remove any remaining grease or debris.
Tape the perimeter of the area to be painted as well as any lights or other fixtures that are in the pool using painters tape.
Pour the gel coat into a 5-gallon bucket and add the MEKP hardener, following the recommendations on the containers. Thoroughly mix the gel coat and hardener using an electric drill with a mixing attachment.
Apply the first coat of gel coat onto the pool using a 9-inch felt roller. Put the gel coat on thick, evenly covering the entire pool. Let the first coat harden, and then apply the second and final coat. Let the gel coat harden for 24 hours.
Remove all of the painters tape.