This may be an odd question on here, and I hope it's in the right place. I'm a musician and I've been touring with an acoustic guitar duo. I've got an instrument called a Cajon. I bought it from a shop, and it was handmade by a local guy. Anyways, it's mostly out of plywood. It's got some dents and chips in it, and it I want to refinish it. Is there a way I could go about doing that?