Repainting a pool doesn't allow just any paint: you must choose the right type according to the shell material and what it was painted with before, because mixing incompatible families makes the new coat lift.
Chlorinated rubber paint: the cheapest
Chlorinated rubber paint is the cheapest option and the simplest to apply, suitable for concrete pools previously painted with the same type of product. It has a shorter durability (roughly 2-3 years) and needs periodic repainting.
Epoxy paint: more durable, more demanding in preparation
Two-component epoxy paint offers greater hardness and durability (up to 6-8 years depending on maintenance), but demands much stricter surface preparation: completely removing the previous paint if it is of another family, and applying it with the pool completely dry and at the right temperature.
Why you can't just apply epoxy over chlorinated rubber
Applying epoxy paint directly over an old coat of chlorinated rubber without removing it means the new paint doesn't grip well and peels within a few months. The quote must always include checking (or stripping) what paint the shell had before.
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