To seal the Federal Stone AQ Series 12x24 White Plain Straight Safety Edge Coping and prevent stains, you can use a penetrating sealer specifically designed for stone surfaces. Here are some steps to follow: Clean the Surface: Ensure the coping is clean and dry before applying the sealer. Choose a Sealer: Look for a high-quality penetrating sealer that is suitable for stone. Brands like Aqua Mix, Miracle Sealants, and StoneTech offer good options. Apply the Sealer: Follow the manufacturer’s instructions for application. Typically, you would apply the sealer with a brush, roller, or sprayer. Allow to Dry: Let the sealer dry completely, which may take several hours or as recommended by the manufacturer. Reapply if Necessary: Depending on the product, you might need to apply a second coat for better protection.