Not sure where else to put this question. I have a pebbletec pool that that is pretty much covered by the pool deck above. There are parts, next to the waterfall where pebbletec is exposed to the AZ sun . I've heard rumors that its bad exposing pebbletec to the sun and may crack in 10 years. Is this true ? should I continue the deck to cover the exposed pebbletec ? area circled in red in put pic