Armstrong-Clark Natural Oak Semi-Transparent Oil-Based Exterior Wood Stain balances visible wood grain with enhanced UV-masking protection. Designed for softwoods, the formula uses penetrating conditioning oils to rejuvenate wood fibers while drying oils remain at the surface to lock in the conditioning oils and help repel moisture. It can be used on decks, fences, siding, log homes, gazebos, docks and other exterior wood surfaces.