The materials and cost of patching a vinyl pool are approximately $100-$500. You can expect to pay an additional couple hundred if you hire a professional to do the job.
If you're up to the challenge of resurfacing a pool yourself, here are some tips. The size of your pool as well as the surface will affect the types of tools and materials needed.
Cracks can always be seen. They can be caused a chemical imbalance, by UV rays, by slight shifts of the soil underneath the pool or even by natural causes. The veneer might begin to peel. Cracks may collect dirt and alga, which can lead to a large birdbath. It might be time to drain and surface your pool.