Your pool may need a fresh coat of paint.
Over time, the paint on the walls of concrete and gunite in-ground pools begins to chip, flake and fade, which causes problems for the pool's filtering system as the chipped paint becomes clogged in the filter and prevents it from cleaning the pool. Repainting is usually the best option for addressing this issue. While you can hire professionals to perform the job, painting your in-ground pool is something you can do yourself if you are willing to put in the time and effort. Follow every step of the painting process, particularly the preparatory tasks, or the paint may not bond with the wall properly.
Examine the Pool for Cracks or Leaks
After the pool is drained, carefully inspect it for any cracks or possible leaks. If you discover damage that requires repairs, call a professional to address the issues before beginning the painting process.
Sandblast the Surface
Because most in-ground pools have several layers of paint, dirt and other stains, most pool owners sandblast the walls and floor before painting. The sandblaster helps to create a clean, smooth surface for the painting process. However, before using a sandblaster, cover the pool's drain so debris cannot fall in and clog the pipes. In addition, remove all the sand used during sandblasting before moving on to the other steps in the painting process. You can rent a sandblaster from tool rental companies and from some home improvement stores. If you do not have access to a sandblaster, scrape old paint off the pool surface by hand, though this takes much longer and is more labor intensive than using a sandblaster.
Acid Etch the Surface
Prior to painting, wash the surface of the pool with acid. According to Pool Center, a pool maintenance information website, most pool owners use a solution of 1 part water to 1 part muriatic acid for this step. The acid helps etch tiny, porous holes in the surface of the pool so the concrete is better able to soak up the paint and a strong bond is formed. Let the acid solution sit on the concrete for at least 10 minute. Wear protective gear while using the muriatic acid to avoid burns or other irritations.
Wash and Prime
Thoroughly rinse the muriatic acid solution from the walls before painting. Afterwards, wash the walls with trisodium phosphate (TSP), a detergent which helps neutralize the acid and removes any dirt, grease or leftover glaze from previous paint coats from the surface of the pool. Rinse the walls to remove the TSP, and allow the pool to dry completely before applying a coat of primer.
Paint
The final step in the process is to actually begin painting the pool. Three types of paint are used on pools. Chlorinated rubber base paint generally lasts three to five years. Epoxy paint is extremely durable and usually lasts seven to ten years. Acrylic paint is water based, making it easy to clean up. It is used on any type of pool surface and generally lasts two to three years. Acrylic paint may make the painting easier as well because it is used on a damp surface and dries more quickly. Whatever type of paint was used previously on the pool is required for use now to cover up the old coats. Use a paint roller to apply a thick, even coat. Long, slow strokes work best to achieve a smooth finish. For areas that you cannot reach with a roller, use a hand brush. Two coats of paint are typically required for a pool. Allow the first coat to dry completely before applying the second coat.
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