I have a textured bench and it is thicker material there. It's doing great from a wrinkle standpoint on year 3 but it's fading fast with shallow water. Against the wall is darker from partial shade than the outer edge which takes full sun. I don't see how traditional liner material would do any better for fading.
This picture doesn't show the variation on the bench itself, but it gives you an idea of the difference between that and the wall / slope. The floor is taking a noticable hit too but not as bad.
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