Updating the homemade paint booth. I have the wall frames built with enclosed lights but not sure what to use for the walls. Would like to use plywood or sheetrock/drywall but those don't like to get wet. It's not like the walls will get wet everyday but just when I wash the booth down before painting or when washing a car. Not going with plastic this time, though it served me well for many years. Can plywood or sheetrock be sealed and painted (latex or oil base) to protect it from water or is there something else I could use for the walls? Any suggestions will be appreciated.