Arm-R-Seal Oil-Based Topcoats are made with the highest-quality urethane resin, making them extremely durable and long-lasting. Formulated to be wiped on with a cloth or applied with a foam brush, this ambering finish penetrates to provide deep-down protection for that "natural" look. Arm-R-Seal is a durable, oil-based topcoat made with high-quality urethane resins for exceptional durability.  This easy-to-apply finish will bring out the natural beauty in hardwoods such as Walnut and Mahogany and will amber over time.