Can anyone assist with the following please. The pointing in a patio put down some years ago cracked. I removed all the pointing and then replaced it, aware that it could happen again.( movement in the garden). It did, so I removed all the pointing and left it open, removing any weeds (a few) as I put down a weed killer. Having jet cleaned the patio over the years, I have washed away some of the bedding material. Does anyone know of any material I could re-point with that will not crack with movement. Some years ago I believe Wickes had something which met this requirement, but only worked with slab thicknesses of about 20 mm. My slabs are 30mm thick. Many thanks