Concrete pools are plastered at the time of construction in the United States. Different pool coatings can be used in different areas of the United States when the original plaster becomes damaged or stained from years of acid cleaning and poor water chemistry. The pool coatings are then applied over the plaster. The plaster must be in good condition. If it has spalled from the concrete shell below, it will need to be repaired.
The cost of materials can often be significantly more than the labor costs. Prices for basic plaster can range from $1,000 to $50,000 for designer tile.
The plaster must be in good condition before you can repaint a swimming pool. The plaster surface should be prepared with a wash with muriatic acid, followed by a rinse using TSP (trisodiumphosphate) and warm water. Use TSP and muriatic acid with extreme caution. Always follow the manufacturer's instructions. The old paint must be compatible. Rubberized latex paint will not adhere to epoxy, and vice versa.