On 05/10/2013 14:02, Tim Watts wrote:
On Saturday 05 October 2013 13:30 stuart noble wrote in uk.d-i-y:


I suppose in theory the usual lightweight wall tile adhesive won't take
the same weight as a cement based product, and that may make it
difficult to bed down firmly when you're laying the tiles. That's
probably why there's no such thing as a lightweight bricklaying mortar.
I can't imagine water resistance is an issue though.
I've no doubt it would work just fine but it ain't my floor :-)

Tub/readymixed adhesive is not waterproof (although it may tolerate water in
small doses) - that's one of the main issues. It is also not that hard
setting. Can't beat a cement based product for this type of work


My albeit limited tests suggest that these ready mix microsphere
products, whether they're labelled as plaster, filler, or adhesive, to
be at least as waterproof as cement. IME they certainly work well as
exterior fillers, regardless of what the label says.