Personally, I don't see how a pillow case is any protection against oils leaching from unsealed wooden surfaces over long periods of time. How is that any different than the quilt surface 'protecting' the batting from staining...which it doesn't. Wood oils penetrate pillowcases the same as they penetrate quilting cottons, going right through and staing the next layer. Better to seal the wood with paint or urethane and not have to worry about it anymore. I've seen way to many wood stained vintage table linens to risk storing any fabric in direct contact with unsealed wood or wood by-products.