Many of the old blues players used to play their harps wet, and I imagine they were all wooden-bodied in those days. I think the theory was that the body swells up and cuts out any leaks. The main problem is that the front part swells up and cuts your lips up. You can cut that back with a craft knife. The plastic-bodied type are certainly an improvement and stay cleaner- I play Tombo Lee Oskars mostly.