I have a project for a friend of mine to make a set of small jewelry boxes look very old and rustic. I've never painted wood with an airbrush, so I was looking for any advice. Almost every result I find in searches is to make a wood texture from scratch on non-wood surfaces, but in this case I'm fine with using the existing grain but want to simulate a very old wood texture. Maybe the best solution is to paint it flat and start from scratch, I'm not sure. Any advice would be appreciated.