Product Description Ready Seal 525 Exterior Stain and Sealer for Wood, 5-Gallon, Dark Walnut 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.