---
product_id: 314560842
title: "Cosmoline RP-342\"Heavy\" Rust Preventative Spray (Military-Grade) 3-Cans"
brand: "rp military-grade rust preventatives"
price: "FREE"
currency: ARS
in_stock: false
reviews_count: 8
url: https://www.desertcart.com.ar/products/314560842-cosmoline-rp-342heavy-rust-preventative-spray-military-grade-3-cans
store_origin: AR
region: Argentina
---

# Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 3-Cans

**Brand:** rp military-grade rust preventatives
**Price:** FREE
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 3-Cans by rp military-grade rust preventatives
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/314560842-cosmoline-rp-342heavy-rust-preventative-spray-military-grade-3-cans)

## Best For

- rp military-grade rust preventatives enthusiasts

## Why This Product

- Trusted rp military-grade rust preventatives brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## 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, translucent (see-through) petroleum wax coating 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.

## Images

![Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 3-Cans - Image 1](https://images-na.ssl-images-amazon.com/images/I/51QV6uO6wML.jpg)
![Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 3-Cans - Image 2](https://images-na.ssl-images-amazon.com/images/I/418TBF2U1VL.jpg)
![Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 3-Cans - Image 3](https://images-na.ssl-images-amazon.com/images/I/41AellAtRYL.jpg)
![Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 3-Cans - Image 4](https://images-na.ssl-images-amazon.com/images/I/41zXLupwqiL.jpg)
![Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 3-Cans - Image 5](https://images-na.ssl-images-amazon.com/images/I/41%2BkxJPxxEL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    RP-342
  

*by M***A on Reviewed in the United States on April 17, 2019*

I bought this to undercoat my 2019 Toyota Tundra. I didn’t want rubberized stuff because when I did that on my last truck it flaked off and the truck still rusted. This stuff seems to stick really well. It seems to go on thin and runs if you put it on too thick. That’s what I expected. I plan to do another coat after a week or so just to make sure I get everything. I used about three cans on about 90%of the frame. I plan on coating just about everything under the truck because Wisconsin winters are rough on vehicles and I hate rust. I bought the stupid nine pack and should have spent an extra $10 to get free shipping along with three more cans.

### ⭐⭐⭐⭐⭐ 







  
  
    Highly recommended
  

*by T***D on Reviewed in the United States on January 19, 2019*

This stuff is crazy good at sealing up your vehicle. I sanded the rust hit it with a converter and then sprayed this on. No rust has come back and I live in the rust belt.

### ⭐⭐⭐⭐⭐ 







  
  
    It’s US,..  ...or, RUST!
  

*by A***R on Reviewed in the United States on November 2, 2019*

This product has been around for longer than I can remember,. and it’s been “proven-positive”on its results,!Only drawback, is the red-spray-straws that are inserted into the nozzle tends to “pop-out” when applying the cosmoline in hard to reach areas where slight bending is often done,  I’ve found a simple solution that keeps them in place from “popping-out” is by applying “Hot-melt-glue” to the nozzle around the inserted straw (*way before using the-new full cosmoline spray can,*) ....let-cool, down, this has helped from loosing many straws inside the body cavities.!

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**Shop now:** [https://www.desertcart.com.ar/products/314560842-cosmoline-rp-342heavy-rust-preventative-spray-military-grade-3-cans](https://www.desertcart.com.ar/products/314560842-cosmoline-rp-342heavy-rust-preventative-spray-military-grade-3-cans)

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-03-08*