On Wed, 12 Nov 2008 11:23:51 +0000, Broadback
wrote:

I am in the process of pressure washing my patio, after that is finished
I will need to re-point. Having tried both dry mortar and wet I have
still managed to mark the slabs, though it has come off. Is there a
reasonably easy and quick way of doing it and keeping the mortar off the
slabs? I wondered if something akin to an icing bag might work. Any tips
gratefully received.

Brush dry Postcrete into the cracks, mist coat with water. Set in 10
minutes but can be cleaned off bits it's not wanted on.