You could opt to repair the damage yourself if it is small. If you have a large job to replaster your pool, please refer to my guide on how I repair pool plaster.
While a plaster finish is more expensive than paint, it offers ample protection and a classic look for your pool. Most pool plaster is made of cement, sand, and water, while some higher-end mixtures include marble aggregate. It’s relatively easy to refinish a medium-size pool with plaster for around just $7,000-$10,000 and up, but keep in mind that the coating requires frequent maintenance.
Cracks invariably appear they can be caused by a chemical imbalance or by UV rays, or even by slight shifts in the soil beneath the pool. The veneer may start to peel. In turn, the cracks collect dirt and algae, and pretty soon you have what looks like a giant birdbath. It may be time to drain and resurface your pool.