May 15, 2015 - When repainting a pool that's been painted before, is it any different? . Clean the pool and pool deck with a blower, broom or wet/dry vac to . Mix 1 lb with 2 gallons of water in a flower watering can. Pour the mixture over the walls and floor, while scrubbing with a brush. Rinse clean with fresh water. Acid Wash the swimming pool with a 50% water, 50% muriatic acid solution. Jun 5, 2014 - Acid Etching. Step 4: Mix the Acid. Use a plastic bucket and mix 10% solution of muriatic acid (often available at pool supply or home improvement stores) in water. Step 5: Etching. Brush the solution on the surface. Step 6: Rinse. Step 7: Wash again. Step 8: Rinse Again. Step 9: Let it dry. 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. If you are looking for information about how to paint a concrete pool then you are likely . or for extremely dirty pools you can consider acid washing the surface. Our guide below covers three common pool paint types and their . In addition to cleaning and acid-washing, bare fiberglass or previously painted epoxy . Welcome to our pool surface preparation guide, where we try to guide you through how to . and dangerous, so wear the proper attire and shoes for working in water with acid. . It is recommended to power wash the pool during this process. You cannot paint a pool that was previously painted with Epoxy pool paint with . Once the surface has been washed, you need to ACID ETCH the pool with a . Epoxy paint is the most durable and lasts seven to 10 years before . Scrub the the pool with an acid wash that is half water and half muriatic acid solution.