Purchase the same type of paint previously used on your pool surface: epoxy, chlorinated rubber or acrylic. Remove a chip and have it tested by your local paint dealer to determine the type of paint that was used.
Drain all of the water from the pool and remove any leaves, dirt or debris.
Caulk or patch any existing cracks and holes with hydraulic cement. Follow the cement manufacturer's instructions.
Clean the concrete surface. Remove any old paint by using a power washer or a scraper and wire brush. Ensure that all loose paint has been removed, then sweep the area clean. Use an acid wash mixture of 50% water and 50% muriatic acid to clean the pool surface. Thoroughly scrub the walls and floor with a scrub brush, then rinse the entire surface with clean water. Clean the surface again with tri-sodium phosphate (TSP) to neutralize the acid and remove dense areas of oil or grease. Rinse it completely with fresh water.
Re-rinse the entire pool, including drains, lights, stairs, etc. Pump out any standing water and allow 3-to-5 days for the pool surface to dry. Only acrylic paint can be applied to damp surfaces.
Apply the paint with an extension roller. Start in the deep end and work your way into the low end of the pool. Use a brush to cut in on the tight areas around pool fixtures such as lights, drains and valves.
Allow the paint to dry per the manufacturer's instructions, particularly when using an epoxy paint as timing is crucial to proper adhesion. Typically, you must wait 3-to-5 days for the paint to dry before refilling the pool with water.
Refill the newly painted pool with water and adjust the filter and chemical settings to ensure proper maintenance.
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