Durable All Weather Roof Cement: This black roof cement is designed for use on all types of roofs and is waterproof when dry. Quick Drying Formula: The cement dries fast, usually within 20 minutes of application, allowing you to work quickly. Long Lasting Protection: The cement forms a strong, durable bond that protects your roof from damage and leaks. Easy To Apply: The smooth, black formula is easy to apply with a brush or roller, and can be used on any type of roofing material. Trusted Brand: Made by Gardner-Gibson, a leading manufacturer of roofing materials and cement.