If you're talking underneath the tiles don't sweat it. It will be covered by the grout.
Grout is used between the tiles. Caulk is used generally along the edges. If it is the grout you want to change, you can either dig it all out, or possibly stain it a different color with a grout stain.
Last edited by Blondesense; 03-01-2012 at 11:11 AM.
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