Unfortunately, gelcoat pool applications are a factory process and cannot be reproduced in your backyard. Instead, there are replacement coatings--thermoplastic polymers that are used to resurface fiberglass. Before the new coating is applied, the pool must be fully drained.
What are the main advantages? First, fiberglass lasts for longer than concrete and plaster. Fiberglass absorbs less chemical and organic material because it is smoother. Fiberglass also resists algae stains. A pool with good looks will last for a long period of time when done correctly.
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.
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