DEFY Extreme Wood Stain is a synthetic-resin, semi-transparent wood stain formulated using state-of-the-art nano-technology. Extreme Wood Stain contains zinc oxide particles that reflect the damaging ultraviolet rays from the sun. When you reduce the size of these zinc particles down to the nano level, they become invisible to the naked eye. These nano-particles are distributed at a rate of over 30 trillion per square inch of surface area to provide protection from the sun, much like sun blockers and sunscreen lotions. This VOC-compliant, semi-transparent stain provides the maximum UV protection available, adding a semi-transparent tint to your wood. * SHIPS GROUND ONLY. Provide valid street address at Checkout.