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Tile over glue residue

I have removed square vinyl tile from a concrete floor, I have also scraped the yellow/gold color glue off, there is a sticky residue left, can I install ceramic tile over this?u
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Posted 2016-11-12T20:48:47+0000  by Muggs Muggs
From Custom Building Products technical sheet for VersaBond:

Concrete or plaster must be fully cured and must accept water
penetration. Test by sprinkling water on various areas of the substrate.
If water penetrates, then a good bond can be achieved; if water
beads, surface contaminants are present, and loss of adhesion may
occur. Contaminants should be mechanically removed before
installation. Concrete must be free of efflorescence and not subject to
hydrostatic pressure. Concrete slabs should have a coarse finish to
enhance the bond. Smooth concrete slabs must be mechanically
abraded to achieve proper bond.

Try some mastic remover and/or use a concrete grinder.

Posted 2016-11-12T22:51:05+0000  by Adam444
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