Although it’s used to construct pools, sometimes fiberglass is also used to resurface concrete ones. Theoretically, fiberglass should be superior to plaster because it’s waterproof, so it withstands stains, has a very smooth texture, and is available in many colors.
Concrete shells are used to make in-ground swimming pools. They have been coated with a Portland cement based material called "plaster" which seals and protects the shell. Many plasters are coated with epoxy or paint. The plaster can also act as a substrate for tiles.
So, what is pool resurfacing exactly? What is the process of pool replastering? Your current pool must be in ground concrete and not have any existing plaster, pebble, fiberglass, or tile. The new surface cannot simply be put on top. To apply a new coat or plaster to the existing surface, you must first chip out any plaster and then sandblast the surface. All of these methods are acceptable according to the National Plasterers Council. Each method has its pros and cons. Once the surface has been properly prepared you can now apply the finish coat of plaster or quartz, exposed stone, glass beads, pebbles or polished pool.