General Finishes Outdoor Oil is an exterior-rated penetrating oil that is a wood maintenance preservative. It contains UV prohibitors, heat stabilizers & mildew prohibitors. Use Outdoor Oil for all exterior outdoor wood projects, particularly wood furniture. It can be used by itself, over any stain, and on pressure-treated wood. NOTE: Outdoor Oil may not adhere to extremely oily exotic woods. Outdoor Oil is a PFAS-free exterior wood maintenance preservative. As General Finishes strives for a cleaner and healthier environment, all future product development will be free of “Forever Chemicals."