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You will need to remove most if not all the paint in order to ensure a good bond between the thinset and the tile to concrete.You will need to do this by mechanical means ,do not use any thinner or other solvents to remove this paint as you may cause more problems than what you have now.
Afetr the paint is removed you may want to do a mat test on the slab to check for m.v.e's(moisture vapor emissions)to see if this will cause problems with the bonding of the tile to the slab[8D]
Floorman
floorlayers union local 1310
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