I put the initial color on this weekend. The first step was to haul the thing outside and give is a good spray of Rustoleum "Satin Espresso." I bought a can that advertised 2x the coverage of normal (whatever that means) and there was more than enough in the can to cover the whole table. Just like priming minis, I had to account for the fact that spraying is directional and that I didn't leave any areas untouched because they were in the shadows (so to speak.)
The next color was Apple Barrel Nutmeg Brown (about the same as GW Bestial Brown.) Drybrushing was a lot more difficult than I would have thought. I had bought a large, cheap brush for the occasion, but it kept shedding hairs in the process. I ended up falling back on a higher quality brush with a 2" or so width. I was also surprised at how much the lighter color diminishes as it dries. Maybe it was just a trick of the light in my basement. I ended up going over areas multiple times to get a decent look.
In the picture you can probably see spaces where rocks snapped off the board and left white underneath. On one side of the board I had run an old cd jewel case over it to plane off some of the stuff that sticks up too much. It definitely helped on that side but both sides seemed to have a lot of rock loss from drybrushing. I'll have to go back over the table with a finer brush and some scorched brown to retouch those spots before sealing.
Next step is to drybrush with Apple Barrel Country Tan, then static grass some areas (not sure how I'm going to decide where still) and then seal with a spray bottle of watered down white glue.