X-100 Natural Seal Wood Preservative formula is an oil based wood preservative consisting of essential wood protecting ingredients. X-100 Natural Seal Wood Preservative is designed to penetrate the wood, protecting against cracking, splitting, cupping, curling, sap stain, mold and mildew and against the environmental forces of wind, rain, snow, ice and sun. X-100 Natural Seal Wood Preservative is E.P.A. registered and V.O.C. compliant. X-100 Natural Seal® Wood Preservative is for use on all wood surfaces including cedar, redwood, pine, plywood, T1-11, cypress, fir, dimensional lumber, siding, decking, logs and roofs. X-100 Natural Seal® Wood Preservative is available in transparent and semi-transparent stains. This transparent technology enables the natural wood grain to show for a natural wood finish.