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Unread 06-02-2021, 12:32 PM   #47
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Join Date: Jul 2005
Location: Fairfax, Va
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Not that I've tried but I'm almost certain no mortar is going to adhere to that stainless steel flange in any lasting way. Nor do I think RG will.

Aside from the adhesion of the mortar to the SS, the steel is going to go through an expansion and contraction cycle every time that shower is used, and that cycling may well be enough to break whatever tenuous bond might exist.

RG would be better in that regard, as it can stretch a bit. But I just don't think it will stick well enough to the SS. You could test it, I suppose, by cleaning the inside of the drain assembly then brushing on a coat of RG. Let it dry, then see how easy it peals off.

If I were trying this with that drain assembly I'd probably use a seriously sticky and water proof adhesive like Kerdi Fix.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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