Rust Defender is a one step finishing material from bare metal, body filler plastic, wood, aluminum, or fiberglass to a surface ready to accept any type of paint without concern about penetration of solvents or moisture. Provides fast build-up and fill, is non-shrinking, easy sanding, wet sandable waterproof and self-etching. Rust Defender can be sprayed or brushed on and can be built up like Bondo or Featherfill. can be be wet sanded and then is ready to sand in one hour, and it does not clog up your sandpaper. Pot life and cure time aare about one hour at 70 degrees F. Rust Defender is a versatile polyester filler which can save the homebuilder a lot of elbow work!