One thing to be aware of, the “smooth” side will not be perfect. This plastic practically comes pre-scratched on the non-textured side, but it’s just the nature of the beast. I suppose you could sand a texture into the “smooth” side if you wanted.
Scratches and divots and so forth visible here:
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In a perfect world I’d like to have texture on both sides. But this is how it comes.
It doesn’t bother me because it’s a consumable part much like a tire. The goal of the flaps is to blend in and not be noticed. And they do a good job of that.
I’ll experiment with some resurfacing with some scrap pieces tomorrow out of curiosity though.