I am building a 16X20 storage and work shed. I decided to panel with luan paneling rather than dry wall the interior of the building. I am going to paint the ceiling white to reflect light, however, I want to keep the walls the natural birch color of the luan paneling. I will have dogs in this area as well the normal day to day lawn equipment, so splatters and splashes will be normal as well. My question is this - what do you think I should apply to the walls for protection? Clear wood sealer? Polyurthethane? something else?