Tile problem - adhesive not drying?

[D4dog]

Took a lazy short cut, and may now be paying the price.

Just tiled bathroom floor with beautiful porcelain tiles. Advice from tile shop was to use flexible adhesive for wood, rather than special porcelain glue (seemed sensible, since it was going onto ply. )

unibonded the ply, and laid tiles - but laid on 4mm heating coil, giving an adhesive thickness of about 5mm, which was the maximum quoted on the container (standard ready-mix - should probably have used powdered and mixed myself, I now realise).

however, 6 weeks later, and the tiles, whilst not appearing to move, make a definite "squidge" when walked upon - is this normal for flexible adhesive, or do I have an adhesive problem?

 

[jefoss]

the general rule is if its not dry in 6 weeks time its a load of ****e

never use ready mixed on floors, your advice that you use flex was right, however you need, powdered flexi.

lets all sing together " rip it up and start again"