KerdiFix, once cured, has over 1200psi bond strength. If you support things well while it cures, I'd feel better about it than epoxy...the slight flexibility may be an advantage over epoxy's stiffness. Comes in white and grey.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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