Yes thin your paints down. Wet paletes help out a lot too. I personally like the use of flow improver rather than just water. It seems to hold in the pigments better than water when you do mix it out onto a palet. (apparently I can't spell this morning)
With drybrushing, you really don't want to water down paint, since then it wouldn't be "dry" brushing. You really need to wipe off the excess paint from the brush though, on a piece of paper towel, almost as if there's no paint left on the brush.
Hope this helps and keep on painting!~
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