Thinset Over Painted Concrete Floor


Can one thinset mortar directly to a painted floor or would we have to rent a concrete scraping tool prior to installing?

There is a risk going over a painted floor and would not be warranted by most thinset companies. Best case is to use MBP (multi-surface bonding primer) to at least enhance to bond of the mortar to the substrate. Do a test area. Still not warranted with MBP.  There are shot blast machines that should be able to remove the paint from the surface of the concrete.

Written by Scott Rosenbaum
Posted on

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