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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!

4.6/5

Product ID: 219019337

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Details

Brand
Cosmoline LLC
Color
Black
Finish Type
Gloss
Size
12 Ounce (Pack
Special Feature
Washable
Unit Count
72 Ounce

🌊Resists salt spray & harsh elements

⏱️Dries in 25 minutes

🛡️Military-grade protection

Description

🛡️ Protect like a pro, dry in a flash, and never rust out of style!

SLEEK CONCEALMENT - Glossy black finish hides imperfections while delivering a tough petroleum wax barrier.
VERSATILE USE CASES - Ideal for vehicle undercoating, heavy machinery, firearms, marine gear, and more.
MILITARY GRADE TRUST - Trusted by U.S. Armed Forces since WWII for reliable, long-term rust prevention.
UNMATCHED DURABILITY - One coat shields metal surfaces for years without cracking or washing off.
FAST EFFORTLESS APPLICATION - Spray on dry surfaces and dry-to-touch in just 25 minutes—protect and move on.

Cosmoline RP-342 is a military-grade, black rust preventive spray delivering a durable, washable petroleum wax coating that dries in 25 minutes. Trusted since WWII, it offers long-lasting protection against rust, salt spray, and extreme conditions for metal surfaces indoors and outdoors. Perfect for vehicle undercoating, heavy equipment, firearms, and marine applications, this 6-can pack ensures your gear stays corrosion-free with minimal effort.

Specifications

Brand	Cosmoline Direct, LLC
Color	Black
Finish Type	Gloss
Size	12 Ounce (Pack of 6)
Special Feature	Washable
Unit Count	72 Ounce
Paint Type	Spray
Specific Uses For Product	Vehicle Undercoating, Car Undercoat, Truck Undercoating, Rust Prevention, Rust Preventive
Surface Recommendation	Metal
Indoor/Outdoor Usage	Indoor, Outdoor
Item Form	Aerosol
Age Range (Description)	Adult
Model Name	RP-342
Package Information	Can
Manufacturer	Flywheel Distribution, LLC
Item Weight	7 pounds
Product Dimensions	5.12 x 6.38 x 9.84 inches
Item model number	RP-342
Manufacturer Part Number	342-1032-6
Special Features	Washable

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?

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Anjali K.

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

1 month ago

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3387 DH

Duties & taxes incl.

Moroccostore

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

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

2 weeks ago

Neha S.

Excellent communication throughout the order process. Product is perfect.