An experienced professional will either chip or sandblast the old plaster out, leaving the original concrete shell. Next, a bond coat is applied that is topped with one or two coats of new plaster tinted to your choice of color.
Concrete shells made from Portland cement-based materials are most commonly used for in-ground pool construction. Plaster, which is a sealant and protector of the shell, is what is known in the pool trade. The plaster may be painted, epoxy or fiberglass coated. The plaster can also be used for tile substrate.
The plaster must be in a good state before you can paint a pool. Pros recommend that plaster surfaces be prepared using a wash of muriatic and then rinsed with TSP (trisodiumphosphate). (Note: Use muriatic or TSP with extreme caution and always read the instructions. The old paint should be compatible. Rubberized latex paint doesn't stick well to epoxy, and vice-versa.
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