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no on paint! You will need to replace the liner.
No
The answer is yes, but you must use the same product used by the manufacturer. Be sure to use swimming pool gel coat with a coating of vinyl ester resin first. Life expectancy will be about 20 years.
Vinyl Liner
Pool with a vinyl liner.
Yes
Well first of all there is no such thing as a fiberglass pool. You can have fiberglass walls instead of steel but your pool is still vinyl because you need a liner. These are the usual combinations of inground pools. Sand floor, steel walls, vinyl liner Sand floor, fiberglass walls, vinyl liner Vermiculite floor, steel walls, vinyl liner Vermiculite floor, fiberglass walls, vinyl liner Concrete floor, steel walls, vinyl liner Concrete floor, fiberglass walls, vinyl liner Concrete floor, concrete walls, no liner Concrete pools have to be painted with epoxy paint or if you want tile installed then usually you plaster over the concrete. Now a days 3 and 4 are the most common inground installs. 1 and 2 are usually pools that are 30 + years old although you can still have them done that way. In South Alabama the cost of a 20 *40 vinyl pool will cost around 18 to 22 thousand
Very expensive
High concentrations of chlorine can and will destroy a vinyl liner.
You can't
28 or 30 mil
No. Replace the liner.