By this point the sand/glue was pretty dry, so I decided to go ahead and paint it. Bad decision. It wasn't dry enough, and I made a little mess in a few places. I corrected the situation with liberal application of my hobby blow-dryer.
WARNING!
Don't use your significant other's blow dryer as this may be hazardous to your health!! Just get one for hobby use to simplify things!!
With the sand thoroughly dry, I painted on a nice ochre/yellowish sandy color.
Once the yellow was dry, I added the same tan that I used on the stone, and gave the base a liberal drybrush. I was careful to leave some darker color around the bottoms of the stone bits - I think it looks nice.
Another large helping of tan into the mix and a sporadic drybrush finished off the paint work.
