VHT Pontiac Blue Engine Enamel. VHT 550°F (288°C) Engine Enamels™ are available in a wide range of colours, including exact match factory colours. All colours have excellent durability and superior heat and chemical resistance. They are specially formulated to withstand corrosion, rust, salt spray, chemicals and additives of today’s gasoline blends and degreasers. VHT 550°F (288°C) Engine Enamels™ are a unique blend of urethane and ceramic resins, which produce a tough and long-lasting finish for engines, engine accessories or wherever a tough, durable heat or chemical-resistant finish is needed.