---
product_id: 224216349
title: "Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can"
brand: "cosmoline direct, llc"
price: "₨1395"
currency: SCR
in_stock: true
url: https://www.desertcart.sc/products/224216349-cosmoline-rp-342-black-rust-preventive-spray-military-grade-1
store_origin: SC
region: Seychelles
---

# Dries in 25 minutes Water-resistant formula Military-grade protection Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can

**Brand:** cosmoline direct, llc
**Price:** ₨1395
**Availability:** ✅ In Stock

## Summary

> 🖤 Protect Your Assets with Style!

## Quick Answers

- **What is this?** Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can by cosmoline direct, llc
- **How much does it cost?** ₨1395 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/224216349-cosmoline-rp-342-black-rust-preventive-spray-military-grade-1)

## 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

- • **Trusted Legacy:** Used by the U.S. Armed Forces since WWII!
- • **Fast & Efficient:** Spray, wait 25 minutes, and you're done!
- • **Long-Lasting Shield:** Years of protection against rust and corrosion!
- • **Ultimate Protection:** Defend your metal surfaces with military-grade strength!
- • **Versatile Application:** Perfect for vehicles, tools, and machinery!

## Overview

Cosmoline RP-342 Black Rust Preventive Spray is a military-grade aerosol designed to provide the strongest, longest-lasting, and fastest-drying rust protection for metal surfaces. With a quick-drying formula that creates a durable, non-tacky black wax coating, it effectively shields against salt spray, extreme temperatures, and harsh environments. Trusted since WWII, this versatile spray is perfect for both commercial and DIY applications, ensuring your tools, machinery, and vehicles remain rust-free for years.

## Description

Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Cosmoline Direct, LLC |
| Color | Black |
| Finish Type | Gloss |
| Size | 12 Ounce (Pack of 1) |
| Special Feature | Washable |
| Unit Count | 12.0 Ounce |
| Paint Type | Spray |
| Surface Recommendation | Metal |
| Indoor/Outdoor Usage | Outdoor, Indoor |
| Item Form | Aerosol |
| Age Range (Description) | Adult |
| Is Waterproof | True |
| Package Information | Can |
| Color Code | Black |
| Coverage | long-term protection |
| Water Resistance Level | Water Repellent |
| Product Dimensions | 5.12 x 6.38 x 9.84 inches |
| Country of Origin | USA |
| Manufacturer Part Number | WSF-01 |
| Special Features | Washable |

## Product Details

- **Brand:** Cosmoline Direct, LLC
- **Color:** Black
- **Finish Type:** Gloss
- **Size:** 12 Ounce (Pack of 1)
- **Special Feature:** Washable
- **Unit Count:** 12.0 Ounce
- **Paint Type:** Spray
- **Surface Recommendation:** Metal
- **Indoor/Outdoor Usage:** Outdoor, Indoor
- **Item Form:** Aerosol

## Images

![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can - Image 1](https://m.media-amazon.com/images/I/41LpxM6vAPL.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!

## Frequently Bought Together

- Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 1-Can
- MSNOR Cosmoline RP-342 Heavy Rust Preventative Spray (Military-Grade) 1-Can
- Rust-Oleum 248658 Rust Reformer Spray, 10.25 oz, Black

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-03-13*