Polyester‑based chemical resistant coating for aircraft waste tanks. Starblok™ 640 is engineered to protect aircraft waste tanks against corrosion and deterioration caused by fuel, hydraulic fluid and dilute acids. It offers outstanding chemical resistance, extremely low VOC levels, long pot life, a short learning curve for application, fast drying, no induction time, easy blending and outstanding performance. The coating is available in both colours and clear and may be applied directly over properly prepared substrates.