Yes, replace the liner. Nothing can put the color back into plastic or vinyl or glass or steel.
Hum, just what are you gonna use to color vinyl either under water or out of water???? NO.
no on paint! You will need to replace the liner.
There are a number of ways you could remove stains from worms on a vinyl liner. You could use cleaners.
High concentrations of chlorine can and will destroy a vinyl liner.
No. Replace the liner.
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
We used Garrett Vinyl Pools they have been around for years.
The vinyl liner should bond together with PVC glue from lowes or Home Depot. There is even a PVC liner that can be used with the glue to patch tears rips and holes.