Rust-Oleum215215 Stops Rust Rust Reformer Rust Reformer 10.25-Ounce Spray-Color Black (Pack of 2)

It works great. The color doesn't matter, if you are making sure your rust is under the vehicle. If it has spread get a color chart form a dealer for your vehicle and go from there.

I use this alot and Amazon has a better price than the stores have

It was easy to use had a little smell so make sure you use in a well ventilated outdoor area. It deed fair quickly and has great coverage. My patio table and chairs look like they are brand new although they are almost 10 years old

Great product

I detailed the undercarriage of my classic car. It took many cans, but well worth it!

Good coverage

Great for undercarriage

I bought this specifically because it said you did not need to sand prior to painting. I wish I had sanded. The paint adhered fine but it did not paint as much as I would have liked. I will end up buying more to repaint, after sanding this time.