NANO Penetrating Wood Sealer deeply penetrates the wood surface to protect and stabilize against water damage and decay. The water based formula uses proprietary nanotechnology to form a flexible breathable barrier by coating the wood fibers at the cellular level. Prevents rot, decay, mold, mildew and fungi growth. Non-film forming clear formula allows wood to silver naturally and evenly. Eliminates warping and cupping caused by water intrusion.