On Wed, 30 Jan 2008 17:38:21 +0000 The Wanderer wrote :
Err, so asking a daft question, what sort of tiles would you stick
to a wall using wall tile adhesive if not porcelain?

Regular ceramic ones. AIUI the distinction is that these have an
impervious glaze on a porous body whilst porcelain is totally
impervious. No doubt someone will follow up with a better definition.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk