On Sat, 05 Oct 2013 14:02:59 +0100, Tim Watts wrote:

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

THanks. And what about grouting? Do you need a special type for floor
tiles? I only ask 'cos I've got about 10kg of wall tile grout left over
as well. Would be nice to use it up!