From what I understand after doing a lot of research on this, the newer all PVC brands like Azek have solved a lot of the problems from the older composite material boards. We're currently having a new Azek deck installed replacing our older wood deck. Much more scratch and stain resistant than the composite and also resistant to mold since the spores are unable to penetrate the surface unlike the composite decks which use recycled wood and plastic particles. Time will tell.
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