Cabot Semi-Transparent Natural Driftwood Gray Acrylic Bleaching Stain 1 gal. (Pack of 4)Cabot semi transparent stain is a Bleaching Stain uniquely formulated to accelerate the natural weathering process of uncoated exterior wood. The wood stain contains a small amount of gray pigment and a chemical ingredient that actually bleaches the wood's surface. When first applied, this exterior stain gives a delicate gray tone, and during the first few months' exposures, the Cabot deck stain gradually turns into a beautiful, natural driftwood gray