---
product_id: 219019337
title: "Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans"
brand: "cosmoline direct, llc"
price: "VT58201"
currency: VUV
in_stock: true
reviews_count: 8
url: https://www.desertcart.vu/products/219019337-cosmoline-rp-342-black-rust-preventive-spray-military-grade-6
store_origin: VU
region: Vanuatu
---

# Dries in 25 minutes Withstands extreme temps & salt spray Protects metal for years Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans

**Brand:** cosmoline direct, llc
**Price:** VT58201
**Availability:** ✅ In Stock

## Summary

> 🛡️ Spray once, protect forever—because your gear deserves military-grade armor!

## Quick Answers

- **What is this?** Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans by cosmoline direct, llc
- **How much does it cost?** VT58201 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/219019337-cosmoline-rp-342-black-rust-preventive-spray-military-grade-6)

## Best For

- cosmoline direct, llc enthusiasts

## Why This Product

- Trusted cosmoline direct, llc brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fast-Dry Formula:** Ready to handle your gear in just 25 minutes—no waiting around
- • **Military-Grade Rust Defense:** Trusted by U.S. Armed Forces since WWII for unmatched durability
- • **Versatile Industrial Strength:** Perfect for vehicles, machinery, firearms, marine gear, and more—1,000s of applications
- • **Invisible Armor for Your Metal:** Non-tacky black wax finish conceals rust and resists cracking or washing off
- • **One-Coat, Long-Term Protection:** A single spray shields metal surfaces for years indoors or outdoors

## Overview

Cosmoline RP-342 is a military-grade, fast-drying black rust preventive spray that delivers a durable, non-tacky petroleum wax coating. Engineered to protect metal, steel, and iron surfaces from rust for years, it withstands harsh environments including salt spray and extreme temperatures. Trusted by the U.S. Armed Forces since WWII, this aerosol spray offers one-coat protection ideal for vehicle undercoating, heavy machinery, firearms, and marine equipment.

## Description

Military-Grade Rust PreventionModeled after Military Specifications: MIL-PRF-16173, Grade 4 and MIL-C-83933.Application:IMPORTANT #1: Make sure your surface is clean and dry (not oily or greasy) to ensure best possible adhesion.IMPORTANT #2: RP-342 is a heavily-concentrated rust preventive. For best results, each spray can should be shaken vigorously for about 2 minutes to ensure a uniform coat. The aerosol cans should also be shaken intermittently during longer application sessions.GENERAL INSTRUCTIONS - Spray a generous, even coating on your surface and let dry. While a single coating will provide exceptional protection, additional coats can be applied if desired. If applying multiple coats, always let previous coats dry completely before applying the next coat. Ideally, it’s always preferable and recommended to apply over a non-rusted surface, however, RP-342 can be applied over moderate surface rust. RP-342 will prevent surface rust from spreading. RP-342 should not be applied over flaking or pitted rust…..these advanced types of rust should be treated prior to applying RP-342. The typical first application dry film thickness is 2.0 Mils (51 Microns).Common Applications Include (but are not limited to):- Vehicle undercarriage / undercoating (cars, buses, trucks, etc.) - the most popular application!- Parts & equipment storage- Overseas transportation- Heavy machinery & equipment (storage & in-use applications)- Packaging- Dies, molds, lathes, shafts and beams- Offshore drilling equipment, platforms & infrastructure- Farm implements- Boat shafts and propellers- Marine fittings- Rifle & other firearms preservation / storage- Garden tools & lawn mower blades- 1,000s of applications! Reliably protects any surface that might rust on you!

## Features

- OUR STRONGEST, LONGEST-LASTING & FASTEST-DRYING Rust Preventive Aerosol, PERIOD! 1-coat can reliably protect any metal, steel, or iron surface (parts, equipment, tools, machinery, etc.) for Years!.....indoors or outdoors.
- DURABLE & TOUGH – Will not crack, craze, blister, run or “wash off”. RP-342 produces a dry-to-the-touch (non-tacky), amber, BLACK petroleum wax coating (perfect for concealing unsightly surfaces) that stands up to long-term salt spray, extreme temperatures and other harsh environments.
- EASY-TO-APPLY: Just spray onto a dry surface, dries in about 25 minutes; You’re Done!
- TRUSTED SINCE WWII – has been widely used & trusted by the U.S. Armed Forces, government agencies, commercial companies, and DIYers/consumers for generations.
- 1,000s of APPLICATIONS across commercial and private industries. Vehicle undercoating is one of the most popular applications. Easily stands up to road salt, chemicals, road debris and won’t wash off like many other undercoating products. One application/coating can protect for years.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Cosmoline Direct, LLC |
| Color | Black |
| Finish Type | Gloss |
| Size | 12 Ounce (Pack of 6) |
| Special Feature | Fast-Drying |
| 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 |
| 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 | Fast-Drying |

## Product Details

- **Brand:** Cosmoline Direct, LLC
- **Color:** Black
- **Finish Type:** Gloss
- **Size:** 12 Ounce (Pack of 6)
- **Special Feature:** Fast-Drying
- **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

## Images

![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans - Image 1](https://m.media-amazon.com/images/I/51DyRGK+acL.jpg)
![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans - Image 2](https://m.media-amazon.com/images/I/81N+IOwjdFL.jpg)
![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans - Image 3](https://m.media-amazon.com/images/I/71DhgsOzXSL.jpg)
![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans - Image 4](https://m.media-amazon.com/images/I/815FX31EOfL.jpg)
![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans - Image 5](https://m.media-amazon.com/images/I/71MVSgGY+dL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**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?**
A: 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?**
A: yes but your pipes will be sticky forever

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great undercoating!
*by S***K on March 2, 2025*

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.

### ⭐⭐⭐⭐⭐ This product is all that is needed to rust proof your vehicle !
*by A***R on June 18, 2025*

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.

### ⭐⭐⭐⭐⭐ Easy to Work With
*by E***R on August 22, 2025*

Good product

## 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

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-01-24*