Rustproof like a pro-Undercoating Gun makes applying undercoating materials as easy as pulling a trigger Undercoating Gun Kit comes in very handy when you need to apply our Heavy-Duty Anti-Rust, Rubberized Undercoating and Spray-on Bedliners. Rustproof inside rocker panels, inner fenders and other closed box sections 32" long, flex hose/wand with 360 degree misting nozzle is for applying thinner materials such as rust proofing to hard-to-reach hollow areas 24" long, flex hose/wand with single 1/4" orifice for applying thicker materials such as undercoat, bed liner, soundproofing, heat barrier and more to tight spaces and internal areas of frames. Requires 40-60 psi @ 5-6 cfm