Product Description Ready Seal 520 Exterior Stain and Sealer for Wood, 5 Gallon, Redwood From the Manufacturer Ready Seal stain enhances the natural beauty of the wood allowing the texture and grain of the wood to remain visible. This stain is an oil-based, semi transparent stain and sealer in one, suitable for all your exterior wood projects. It is a unique formula that penetrates deeply to protect and preserve wood from the elements such as mold, mildew and damaging UV rays.