Permatex® Heavy-Duty Rubberized Undercoating – Permatex
For best adhesion, apply to clean and dry surfaces. Tap bottom of can to loosen agitator ball. Shake can for at least two minutes after ball is loose (agitator ball may stick to bottom of can for some time). Apply a uniform coating, holding can 10-12 inches away from surface area. Multiple coatings are more effective.