CRC 12 oz Carnauba Based Marine Wax Paste The CRC Trewax Boat Paste Wax, part number CRC-MK66, is a premium marine wax formulated to protect and enhance the appearance of boats and other watercraft. This wax contains Carnauba, known as the world's hardest natural wax, providing a durable and long-lasting finish. Designed specifically for marine environments, Trewax Boat Paste Wax safeguards against the harsh effects of sun, salt, and water, keeping vessels looking their best.