Just had some VAT removed from the concrete basement floor. There was black mastic underneath that was also removed with a heavy duty solvent (methyl ethyl ketone I think it was).
I hear the mastic residue can react with other adhesives and cause problems. The floor needs to be skimmed before recovering with ceramic tile. Is there a skimming compound or sealant I can use that will stick to the concrete, or will I have to put in a new subfloor?
If the old adhesive was removed, I would bet the problem of adhesion would be pretty small. Have you asked around about a bonding agent that may get good adhesion?
I know there are a lot of tile professionals over at the http://www.GroutCleaning.com forum that may be of help, along with the advice here, of course.
Can you still feel the adhesive on the floor? Or is the floor just stained from the original application... that methyl should have done a pretty good job, it it was the right chemical for that adhesive; it's strong stuff!
The tile industry says that chemicals should never be used to remove prior adhesives and their residues. Only mechanical eradication is acceptable due to the chemicals interference with tile adhesive bonding.
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