Bondo Professional Gold Filler is adhesion promoted for double-coated galvanized steel used on newer vehicles, plus aluminum, fiberglass, SMC and more. Advanced 3M resin technology makes it extremely easy to mix with the included hardener, and it applies smoothly and is easily sandable in minutes. The result: Simpler professional-grade auto body repairs in garages of any size. As a brand of 3M, Bondo is well known among collision repair professionals and others who are committed to helping restore the beauty and value to your automobiles. This auto body filler is another way that 3M applies science to life – and helps you rediscover the excitement of owning and operating like-new vehicles.