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Old 11-17-2017, 04:56 PM   #4
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 12,291
IF those bubbles are not within 2" of a seam and you're not using a small mosaic, don't worry about them. Otherwise, you can slit it, stuff thinset in there (or KerdiFix). IF you use thinset, cover with Kerdiband, if you use KerdiFix, you should be okay without, but it won't hurt.
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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