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Unread 02-18-2019, 02:48 PM   #3
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,996
Surface tension will tend to follow the variations in the floor unless it is deep enough. Many of them want at least 1/2" over the top of the highest point on a wooden subfloor. You can do it with less, but it takes more skill.

IMHO, they shouldn't call the stuff 'self-leveling'. Keep in mind, even water isn't exactly a flat surface as can be seen from a droplet on a freshly waxed car.
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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