Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans

I'm a pickup truck guy, and I undercoat every pickup truck I have. Typically I use a lanolin type coating, but tge lanolin doesn't last long. However this stuff, you can quickly see why it is military grade. Thus stuff coats quickly, easily, and we'll. Better yet, this stuff has staying power, it looks and feels like a crayon type wax. One recommendation, invest in a tyvek suit. Thus stuff will get on you, and it takes a lot of effort to get it off.

I wish I discovered this years ago. Lasts a long time and looks great. I’m done wasting time sanding under my truck and painting. It doesn’t last or protect as well as using Cosmoline. Came out awesome

I did the entire underside of my truck over the weekend. The results are better than I expected. I sprayed it on all suspensions parts, bushings, coated my leaf springs and immediately noticed a quieter ride. I have used Fluid-film in the past on my trucks and liked the results, except that it stays oily/wet to the touch. RP-342 has exceptional coverage and dries to the touch, it also makes the underside of your vehicle look like new ! I have also tested this using my pressure washer, it does not wash off once dry. I can't say enough about this product, I will never use anything else.

Works really well for me resealing the wood on the underside of my cargo trailer 👍

Tired of liquid grease undercoats that wash off in a month. Looking for something like the original frame wax that was applied at the factory. This stuff is legit. It actually dries, doesnt wash off, and maintains a pliable waxy feel like oem frame coatings. See photo for treated vs untreated.

This works great, and easy to use.

I wire brushed what I could, and applied over all surface rusted areas, and used woolwax with the pro gun to spray inside the frame rails and areas I couldn't get with these cans. The application process is messy for sure. Wear a cap, face shield, respirator, coveralls, and gloves if you don't wanna have it all over you. After it's cured, it isn't too messy to work on the vehicle. It drys to a hard waxy finish and will transfer a little bit if you rub against it, but nothing like grease. Doesn't smell much at all after a few days either. First couple days it had a typical waxy cosmoline smell. I would definitely recommend it for delaying corrosion. Since it's waxy, it won't flake off and trap water like paint can if it fails. I needed about 5 cans for my 04 Tacoma regular cab.

Goes on smooth and easy, gets good coverage as I used about 3.5 cans on a truck. Remains slightly tacky even after drying.