T
The D
You
your talking rubbish again dan lolYeah I just can see how one grout line is going to allow enough water through to penetrate the cardboard.
It'll end up evaporating out before its managed to soak through the grout. And what does soak through the grout will disperse amongst the adhesive and not really effect the cardboard.
I've been diddled.
Do one with mosaics.