Copper Care Wood Preservatives' Cu-Nap Concentrate (8% Cu as metal) is a liquid Copper Naphthenate wood preservative that can be diluted with diesel or mineral spirits. It is widely used as a dip treatment for fence posts using a 24-hour soak. Cu-Nap Concentrate is labeled for the treatment of posts, poles, lumber, siding, boxes, roof shakes and shingles, fence pickets, landscape timbers, cellulose textiles and cordage. Apply by brush, dip, or pressure treatment. Cu-Nap Concentrate is a cost effective solution for large volume, commercial users. For dilution and other detailed information, refer to the product label, the product flyer, or call us.