I find I get better results using coarse mason's bedding sand than fine. However, I also have a regiment of chaos knights based with fine sand, and I had the same problem with sand falling off. My solution--which I use on all sanded and gravelled bases now--is AFTER the glue had dried overnight, I dip the base in a dish filled with Future(R) Floor Finish. The same stuff that I use to dilute my paint and to make my inks stickier. I just saturate the base and the sand and put the model on a slick surface to dry again. The net result is that I end up with a layer of concrete on the base of the model. When using coarse sand, I find there's no need to paint the sand. I just paint the angled part of the base using whatever color is in use to unify the regiment/army and the base is done. Sometimes I just hit the sanded base with brown ink to heighten the contrast....but Future(R) is the solution to everything.
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