You loose some stability.
no on paint! You will need to replace the liner.
No
Yes, replace the liner. Nothing can put the color back into plastic or vinyl or glass or steel.
There are a number of ways you could remove stains from worms on a vinyl liner. You could use cleaners.
Vinyl Liner
High concentrations of chlorine can and will destroy a vinyl liner.
Yes
A vinyl pool liner lock is a device used to secure and hold in place the vinyl liner of an above-ground swimming pool. It typically consists of a track or groove that the liner is fitted into, preventing it from shifting or coming loose. This helps maintain the liner's position, ensuring a snug fit and minimizing the risk of leaks or damage. Properly installed, a liner lock enhances the longevity and appearance of the pool.
No. Replace the liner.
Very expensive
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
Rubber paint is generally not recommended for use on vinyl pool liners, as it may not adhere properly and could damage the liner. Vinyl is designed to be flexible and waterproof, while rubber paint can create a rigid layer that may crack or peel over time. If you need to touch up or repair a vinyl pool liner, it's best to use products specifically designed for vinyl materials. Always check with the manufacturer for the best recommendations for maintaining your pool liner.