Cosmoline RP-342 "Heavy" Rust Preventative Spray (Military-Grade) 9-Cans

I've tried numerous brands that say they do the same, but nothing compares to this stuff. I had an issue of surface rust appearing on my paper cutter bed. I've many different products to stop the rust,....some did but left a bad finish as I need it to be smooth. This stuff, right out of the can, did the trick. Haven't seen any surface rust appear and the finish is nice and smooth. It's been 2 1/2 weeks since application and it's still going strong. This is my goto from now on. I have a few other things I'll be trying it on as well.

If it works oil, rigs, I’m sure I’ll work on a car

Cosmoline has a history of protecting metal in tough conditions. I applied to the frame of my GMC Sierra 1 ton and enclosed trailers. Simply clean (day before) and then apply. It has an odor for about 2 day, but that is now gone. Really fantastic product with many uses protecting against salt, etc. that normally eats up new vehicles and equipment

Original use for undercoating car. After multiple washes and salty/rocky roads, >98% still on and looking good. Used method of: brushing/sanding rust, clean, rust converter, and then RP 342. Reapplied a couple areas for longevity. Will have to see how long it lasts. Sprayed spare heavily rusted metal (no cleaning) and some galvanized steel to see effectiveness or reaction. Bought 6 bottles, only used 2 for undercoating - only did frame (rest of car AL).Coated tons of outdoor appliances - trailer, garage door, shelf, etc. All looking good.UPDATE: June, 2023- Ok, so I have done a lot of testing with various rust preventatives. Couple ongoing tests outdoors, under cars, etc. Mostly focused on lanoline (Fluid Film, Blast Surface Shield) and cosmoline (RP-342, AMS Oil Heavy Metal Protector). Main takeaways:1- Do NOT use only Rustoleum rust converter spray. Does not protect well, flakes off over time, rust continues underneath. Unless there is mild rust or very clean new surface, it will chip and/or flake away over time. Can coat Rustoleum with Fluid Film (FF) or RP-342, but why use Rustoleum in the first place?2- RP-342 works well with mild to moderate rust, not heavy rust. Be sure to scrape and wipe most rust away.3- RP-342 works best with no physical contact. If a major scrape/dent, RP-342 will not cover all of it. I like putting this on car frames and inside car frames where no road grit will wear it down. Use FF for commonly exposed areas to movement/rocks/etc.4- Haven't had a galvanized steel reaction yet, but could do better testing here.5- Fluid Film vs RP-342? Depends on use, either is fantastic. Think of RP-342 as a heavy mule. Does all the hardlifting, but can't knock it over (big scratches) or move it (does not seep once dry). Stays put and provides excellent protection. Fluid film is thinner, yet sticky. Attracts dust and bugs (no biggie), seeps into new scratches, eventually can be washed off (like, eventually and takes a lot to do it).I found RP-342 to be better at resisting water, but not scratching.Best of both worlds: Do the primary coat or two with RP-342, let dry. Spray FF on select areas for even better protection.

Good stuff. Went on good covers a good area.

I have worked in Oil industry and shipbuilding so have seen parts come in with Cosmoline. First time I have applied on personal (home) equipment. Lot easier to get smooth coat than thought (kind of levels out on its own). Make sure you apply in area that overspray is not going to hit other things....

I typically never leave reviews. I’m just not that type of person, but I felt this time it was needed. I made a mistake and I ordered clear instead of black even though there is a no return policy stated on Amazon for this aerosol product. I contacted them directly and they did not hesitate to exchange my order. Note to anyone using this product when coding the bottom of their vehicles to cover up anything they do not want to get on, including their wheels.

I have been a fan of cosmoline for the past 30 years. As a young man I would help a relative prepare surplus military jeeps for sale. These things were covered in cosmoline in and out. My relative would pull them out of the freight container and some would sit for months of years before being put in doors (ohio winters). Zero rust… we would clean the interior of the jeeps and outer surface with a heated pressure washer, it took forever to clean this stuff off the exterior of the jeeps. I have his farm Jeep that sat outside on grass, topless for 30 years, it is still rust free. Not bad for a 1952. I attribute this to the cosmoline covering everything inside and under the Jeep. Yes I’m the summer it will drip on my drive and when it’s warm I smell like a crayola crayon but I have put this stuff on every vehicle I own. I have yet to have a rust issue.

Using for first time and haven't been put through the rigors of harsh salt and snow conditions yet. Did 2 coats and 1 tin covers a large area. But with the degraded steel being used just about all vehicles are now RUST BUCKETS. not like back in the days when better quality steel was used. Its all about the money unfortunately no pride in producing good quality and getting a good name. Unless you are a member of the rich elites and can afford a carbon fiber, stainless steel or aluminium vehicle. Sad world we living in and being subjected to crap.

Je l’ai utilisé comme protection sur le châssis de mon camion le produit adhère bien mais un peu trop fluide qui laisse des traces sur le plancher du garage

I bought this stuff a few months ago for my future new car.Today I was ready to use it for my new car.When I tried to used it , it seems that nothing almost was coming out of the spray, I decided to try all bottle, but no luck same for all of them , even if i tried previously to shake it well and the ball was running inside....nothing was comming out of the 6 bottles.I tried to get a refund, but no luck i was out of time.Wont buy it again, count on me, its scam