Penofin Blue Label Exterior Oil Stain Transparent Redwood 1-gallon PENOFIN exterior finishes were formulated to safeguard the natural beauty of wood and to prevent discoloration from the sun's ultraviolet rays. Penofin resists and retards bleeding caused by nails. Two key ingredients contribute to Penofin's exceptional abilities: Brazilian Rosewood Oil provides tough, deep-down moisture protection while still allowing the wood to "breathe." There's no surface film to trap moisture, chip, or peel. Microscopically fine, transoxide pigments inhibit ultraviolet damage and darkening. They add deep, rich color without hiding the natural beauty of the grain. Semitransparent mist tones; Nantucket Mist mimics the look of weathered barn wood, Pacific Pearl Mist adds a whisp of white, and Mendocino Mist adds a hint of slate grey.