>>5955917I'd say to skip the dry-brushing if you're using real wood. Instead, use Testor's acrylic paint wash (CreateFX). The stuff soaks into the wood, and gives it a nice, gray aged color. You can also dilute your base color (brown) and rub it on the wood with a rag, and then apply the paint wash. Then seal with a matte clearcoat.
See my examples. On the left is a plastic crate from a military figure set, painted at the factory.
On the right are my various handmade wooden crates, treasure chests and dry goods sacks. The crates are Testor's wash only. The treasure chests have a dilute dark brown acrylic base coat and then Testor's wash on top.
Plastic requires full paint application and drybrush, while wood only needs very light, rubbed-on colors and tints.