• carTopCoat® by Ducora is no ordinary polishing product. Formulated for use as a multi-purpose sealer, and designed as a one-step, easy hand application coating, TopCoat® really is the product created to replace them all. TopCoat is a water based, environmentally safe, high performance protective coating made to replace, out-perform, and outlast traditional waxes, polishes, and sealers in today’s market.