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best using silver sand its very fine and does'nt glog up the gun also make sure you use plasticiser, this makes the mix smoother, i use an everbuild product that has a plasticiser and waterproofer in it. Joe

any of you ever heard of a mortar gun like a silicone gun but you put wet cement in it, 4 red building sand 1 cement and some wather proofer liquid this will stop the frost getting in to the joint. sandstone needs to be layed on a wet bed, i use 4 to 1 mix, 2 washed sand for strenght and 2 red...