He probaly does not sell resin pools!
In my opinion, resin is the way to go, first off it's white, does not attract much if any heat - mine's never even warm.
UV protectants are put in the resin and will likely outlast your wall, mine's going on 3 yrs, no sign of any aging to the resin.
I doubt that a manufacturer would give you 30 years warranty if the salesmans claims are correct.
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