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Unread 10-05-2020, 11:52 AM   #22
cx
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Join Date: Jul 2001
Location: Boerne, Texas
Posts: 92,984
Hai, the only purpose of the flexible sealant in the tile joints at the changes of plane is to provide movement accommodation. If you have grout in those joints, there is no value at all to sealant.

Your choices are to remove the grout and apply the sealant per tile industry standards or just grout the entire joint and take your chances. I have personally grouted many corner joints in new showers and have yet to lose one, but see my warranty information below. It is not uncommon to get hairline cracks when doing that.

I've no long term experience with the MAPEI product, but I have added thin sections to low grout joints with the similar competing Custom product and it works just fine, as advertised.

My opinion; worth price charged.
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