Just this past summer I had the undercarriage blasted and painted on my 2017 F450 dump truck.The mag chloride they use on the roads up here is brutal on vehicles. I had that sprayed, my 2020 F450 Limited sprayed and we just got a 392 Jeep Rubicon that we also sprayed with what i think is called New Hampshire Oil. Its a black liquid that appears like it will last a year or two. It was 300 per vehicle so its not particularly expensive...considering it cost me 5K to blast and paint the dump undercarriage..