You can either scrape off some chips and have them tested at your local paint store, or send them to Ramuc. Acrylic pool paints are $50 per gallon and epoxy is $100 or more. One coat should cover 100 square feet with one gallon.
Profit for the company: It is better to hire a pool plasterer yourself than to contact a company. You will save a lot of money since the cost does not include the company share.
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West Palm Beach Pool Replastering