personally i would lift the tiles then SLS, BUT you can just give the tiles a good scrubbing then lay your SLS, then your vinyl tiles, obviously when the SLS has set
OR
You could rake out as much old grout as you possibly can, then regrout the floor and get the grout level with the faces of the tiles, then lay your vinyl tiles
if your fitting over ceramic tiles(and dont WANT to lift them)..
then clean tiles with sugar soap/dry them..
then use a 2 part slc(latex based)..
then i would advise a adhesive from.. F-BALL.. styccobond range.
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