i hate given customers advice on such questions - for me thers to many factors from any possible previous treatments - so i dont.
we do most treatin of tile an stone well before its fixed down.
go into the well nown tile suppliers an theyl advise a bit further maybe - but they realy want to sell you containers of chemicals.
just sayin but that high gloss can wear off in no time - if you have kids forgettaboutit.
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