C2 Guard is an eco-friendly/non-toxic sealer for wood surfaces. Guard absorbs further into wood than any other product, providing a flexible polymer to protect the wood from a cellular level. The structure resists water penetration to such a remarkable degree that it helps prevent cracking, splitting, and warping, while also reducing effects of mold and mildew on the surface. 12 Beautiful colors available to fit your wood (clear is also available). Due to it's deep penetrating formula and cellular structure, Guard works extremely well as a pre-treatment on wood surfaces prior to paint or varnishes.