Want to put a row of 4x4 ceramic tiles where there used to be Formica. When the Formica was removed it took the top layer of the sheetrock with it, leaving a rough gray-brown paper surface. Should that be primed before setting the new tiles, or will the rough and somewhat porous surface make for better adhesion?
Also, since the tiles have small projections that keep them from gutting tightly together at the "front," do I still need to use spacers? It seems to me that there will be plenty of space to fill with grout.
Perce