Yes. I did contact ardex;
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Leo,
8+9 and X-5 are approved products by ARDEX to be used with Schluter Kerdi product.
Bob
Sent from my iPhone
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I'm trying to see beyond the bickering here, to be able to build the best DIY shower I can. I know I can follow mfg guidelines and it will be good enough, and likely will not have any problem, no arguing there. But I also don't see any issue with making it better, if I can use a better material, why not? If I can add an extra layer of protection, why not? I don't think that by doing that, it takes anything away from the original plan.
My buddy has a spray in bed liner on his truck, he also has a plastic tonneu cover, either one by itself protects the factory finish. But nothing wrong with having both.
Leo