I have about 6 square meters of crazy sandstone that has been laid in the past on soil. Recently I had someone using a power hose clean the sandstone and that has created deep fissures between the stones about 2 to 3 cm. wide and 2-3 cm. deep that I would like filled. Can I use the 1/5 cement sand mixture that you advise in my situation .....that being that the sandstone has been directly laying on soil for the past 50 or more years?
Thanks Joyn