"Greg Esres" wrote in message
oups.com...
My tiling book says to sand the concrete with a coarse grit sandpaper
and then wash with muriatic acid. A friend of mine thinks muriatic
acid is way overkill and just washing the floor would suffice. I'd
rather avoid using the stuff. Any thoughts?

(BTW, concrete is interior slab...seems smooth. Troweled surface?)


The purpose of the acid is not to clean the floor but to etch the surface
for a better bond. I don't know if it's necessary for tiling but I can tell
you it sure is for painting. When in doubt, follow the instructions and
ventilate as much as possible.

Steve.