Fluid Film Black Non-Aerosol, Long Lasting Corrosion, Penetrant & Lubricant, Anti-Rust Coating, Protects All Metals in Marine and Undercoating in Automotive & Snow-Handling Vehicles, 5 Gallons

I love this

Fluid film is a great product. super easy to apply if you have a car lift, undercoating gun and a little ambition. If you have any over spray, it wipes right off with a cloth, No staining. If you live on gravel, or dusty road, you're in luck! Once some dust adheres to this stuff, it helps create a firmer, longer lasting bond to the frame. And yes, it will creep into every crack and crevice, preventing any further rusting. Over time, you will have to reapply this stuff in areas hit hardest by water, snow, etc. Avoid using "Undercarriage wash" option at the car wash, as it will remove this stuff.

I installed it on both my trucks last year and it is still there. I sprayed a f550 and a gmc 2500 with it and still have some left over for touching it up this year. I do recommend doing it on a hot day so the oils get in all the cracks and hard to reach spots that salt likes to go.

This isn't the first undercoating product I've used but I suspect it will be the last. It can be somewhat messy to apply but it is very easy to work with. I use a paint stirrer for a drill to thin the product before putting it into the fluid film canister.

Works better than imagined, I will definitely buy again

Great deal on fluid film black. Save your chassis from salt & use fluid film, any color

Fluid Film Black’s thick, non-aerosol formula clings fiercely to metal—perfect for undercoating, marine use, or winter vehicles. Stops rust cold and lasts!

I spray this stuff on my truck, car, and my daughter's vehicles using a small sprayer attached to my air compressor. A little tip; get a small paint mixer drill attachment to loosen up the material before use, it applies so much better.