3M Rubberized Undercoating Aerosol Spray, 08883, 19.7 oz, Textured Finish, Anti-Corrosive, Multi-Purpose for Automotive Cars, Trucks, and Recreational Vehicles Black

Worked great. Was able to do both rear fender wells on a 2024 F150 with one can. I did a light coat just to protect the paint before installing plastic fender liners. If you are using this as the only protection for your fender wells I would recommend 1 can per well. Spray nozzle is just right for this task

Used on the rear fender wells of a new 2023 Silverado. Easy to apply (mask carefully) and durable.

I use this product on the underside of my street Rod. It left a beautiful appearance.

Sprayed underneath the truck on all the rusty areas. Also painted my chrome bumpers black with this and it seems to be holding up well.

I bought this product to spray on the inner fender wells of my pickup. I generally have a very good opinion of 3M products plus other reviews on this product were good so I felt confident with this purchase. I must say, it does apply nicely and evenly. It dries quickly enough that a second coat can be applied after about 10-15 minutes and I did add a second coat. It doesn't drip either which is a big plus in my book. The product dries to an even, smooth texture that's a slate gray color. The result looks promising. The only qualifier is that I haven't had the truck in a situation where I would know if the product is durable. Only time will tell on that and that's the only reason I gave it 4 stars. I still have about half the can left and I did give the fender wells a thorough coating so I'm also happy with the price per area ratio.If this product is deficient in any way, I will update the review.

Works as a great corrosion inhibitor under my Nissan Rogue and under my Nissan Frontier. lf you intend to keep your car long , use this !

Went on great and covered excellently.

Sprayed on the trailer frame and substructure. Seems very tenacious. We'll see how long it lasts.