Let me make sure I understand here. You have a above ground pool, flexible metal frame on dirt. And you want to resin/glass it. There are 2 classes of resins- polyester and epoxy. Polyester is immune from UV attack, brittle, and has a high viscosity. This makes it difficult to apply on vertical surface without running before it kicks off. And any flex in the metal frame when somebody cannonballs the pool will crack the resin.
Epoxy on the otherhand is succeptable to UV attack, flexible, and has a much lower viscosity. It would survive the cannonballs and apply more easily with out the running and sagging, but the sun would destroy it in a few years. Either way the labor is intensive, and the materials are very expensive. The solvents a carcinigous.
You are much better off finding a vinyl liner that is twice as thick as the ones you have been using. Your complaint is a common one and I would expect that some manufacturer has come up with after market liners that hold up.
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General C&ontractor
35 years of troubleshooting construction, remodel, component & material failures. What to do next