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

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

Q: Por15 my van frame, inner fenders, axles, etc now deciding if i need to shoot my chassis black paint & cosmo or if i can skip painting? uv protection?

As with everything, preparation is key. Paint alone does not cut it here in upstate New York (The Rust Belt). In my case, the entire underside of a ‘08 Tundra here’s what I did. A good up close and personal power washing. Then pump sprayed the correct mixture of Salt-Away, rinsed thoroughly and let dry. Did those steps a second time just because I’m ocd. Black Star where necessary, primer when ready and topcoat with black paint. Mask off entire exhaust, rotors, calipers, and anything that could be oversprayed,pull tail lights and fender liners. I used cosmoline rp-342 black, 15, 12oz rattle cans, shaken continuously and done on a nice day with no wind and 65 degrees. Does not need to be sprayed heavily and can be second coated. I used a can or 2 of the “Heavy” amber formulation when coating any of my painted areas, such as behind the cab and front of bed, under tailgate and vulnerable areas in the engine compartment. Definitely dress like your installing fiberglass insulation because this stuff stays “Anywhere it touches”, getting it off of your skin is not fun. All of that work has just been put through a pretty nasty winter here with salt getting encrusted everywhere and anywhere it could, with trips to the power washer when I could, to get it off. I know this isn’t a long test duration, but that cosmoline is holding its own and then some. I will never use anything else when I do another vehicle, worth every penny! This stuff is Mil-spec for a reason.

Q: Can this be applies over gas metal pipes?

yes but your pipes will be sticky forever

Q: Can this be applied over rust-oleum automotive rust reformer or vht rust converter?

Yes, RP-342 can be applied over any DRY surface (not oily or greasy) to ensure the best possible adhesion.

Q: Is Spray can compatible with wands for spraying inside rockers? cap male or female - tube on cap or tube on can?

Hello, unfortunately the cosmoline tip is a male. The wands spray top that I got from a different cavity wax company are female. If you’re handy enough, I’m sure it’d be possible to retrofit the cosmoline spray tip to accept the wands brass fitting. My thoughts on that would be to carefully drill the tip to just undersized of the brass and insert, followed by wrapping with hot glue. I know this is possible because I’ve had to hot glue the extension wands onto the spray tips to keep them from dislodging. Hope this helps!

Product ID: 741217087

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Details

Brand
BUTO
Colour
Black
Finish type
Gloss
Size
12 Ounce (Pack
Special features
Washable

🌊Resists salt spray & harsh elements

⏱️Dries in 25 minutes

🛡️Military-grade rust protection

Frequently Bought Together

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

Cosmoline RP-342 Heavy Rust Preventative Spray (Military-Grade) 6-Cans

Rust-Oleum 248658-6PK Rust Reformer Spray, 10.25 oz, Black, 6 Pack

Description

🛡️ Protect like a pro, dry in a flash, and never look back!

FAST DRY FORMULA - Get back to work in under 30 minutes—no waiting, no hassle.
SLEEK BLACK FINISH - Conceals imperfections with a smooth, glossy petroleum wax coating that won’t crack or peel.
LONG LASTING SHIELD - One coat guards metal surfaces for years against rust, salt, and chemicals.
EFFORTLESS APPLICATION - Spray on dry surfaces and done—no mess, no fuss, just reliable rust prevention.
MILITARY GRADE DURABILITY - Trusted by the U.S. Armed Forces for decades—ultimate protection you can rely on.

Cosmoline RP-342 is a military-grade, black petroleum wax rust preventive spray that dries in 25 minutes and provides years of durable protection against rust, salt spray, and harsh environments. Trusted since WWII, it offers a sleek, non-tacky finish that won’t crack or wash off, making it ideal for vehicle undercoating and industrial use.

Specifications

Manufacturer	Flywheel Distribution, LLC
Part number	342-1032-6
Item Weight	3.18 Kilograms
Product Dimensions	13 x 16.2 x 25 cm; 3.18 kg
Item model number	RP-342
Size	12 Ounce (Pack of 6)
Color	Black
Finish	Gloss
Material	Petroleum Wax
Specification met	Modeled after Military Specification MIL-PRF-16173, Grade 4
Special Features	Washable
Specific uses	Vehicle Undercoating, Car Undercoat, Truck Undercoating, Rust Prevention, Rust Preventive

Have a Question? See What Others Asked

Por15 my van frame, inner fenders, axles, etc now deciding if i need to shoot my chassis black paint & cosmo or if i can skip painting? uv protection?

Can this be applies over gas metal pipes?

Can this be applied over rust-oleum automotive rust reformer or vht rust converter?

Is Spray can compatible with wands for spraying inside rockers? cap male or female - tube on cap or tube on can?

Common Questions

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Received my product in pristine condition. Great service overall.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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The product quality is outstanding. Exactly what I needed for my work.

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