--- product_id: 224934261 title: "Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans" brand: "cosmoline direct, llc" price: "AR$1452145" currency: ARS in_stock: true reviews_count: 8 category: "Cosmoline Direct, Llc" url: https://www.desertcart.com.ar/products/224934261-cosmoline-rp-342-black-rust-preventive-spray-military-grade-24 store_origin: AR region: Argentina --- # Fast 25-min dry time Waterproof & salt spray tough Military-grade rust defense Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans **Brand:** cosmoline direct, llc **Price:** AR$1452145 **Availability:** ✅ In Stock ## Summary > 🛠️ Protect like a pro—rust doesn’t stand a chance! ## Quick Answers - **What is this?** Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans by cosmoline direct, llc - **How much does it cost?** AR$1452145 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/224934261-cosmoline-rp-342-black-rust-preventive-spray-military-grade-24) ## 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 - • **Invisible Armor:** Black petroleum wax finish conceals rust and withstands salt, chemicals, and road debris. - • **Unmatched Durability:** One coat shields metal surfaces for years without cracking or washing off. - • **Versatile Protection:** Ideal for vehicle undercoating, heavy machinery, marine gear, firearms, and more. - • **Effortless Application:** Spray on dry surface, dries matte and non-tacky in just 25 minutes—done in a flash. - • **Military-Grade Reliability:** Trusted by U.S. Armed Forces since WWII for extreme environment protection. ## Overview Cosmoline RP-342 is a military-grade, fast-drying black rust preventive spray that delivers long-lasting, waterproof protection for metal surfaces indoors and outdoors. Trusted since WWII, it forms a durable, chip-resistant petroleum wax coating that withstands harsh environments including salt spray and extreme temperatures. Perfect for vehicle undercoating, heavy equipment, marine applications, and more, it dries matte and non-tacky in 25 minutes, providing years of reliable rust defense with just one coat. ## 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! Review: Great undercoating! - 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. Review: Awesome - I wish I discovered this years ago. Lasts a long time and looks great. I’m done wasting time sanding under my truck and painting. It doesn’t last or protect as well as using Cosmoline. Came out awesome ## 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 | |---------------|-------| | ASIN | B0888RMFC3 | | Age Range Description | Adult | | Best Sellers Rank | #115,145 in Automotive ( See Top 100 in Automotive ) #263 in Care Corrosion & Rust Inhibitors | | Brand | Cosmoline Direct, LLC | | Brand Name | Cosmoline Direct, LLC | | Color | Black | | Container Type | Can | | Coverage | long-term protection | | Customer Reviews | 4.6 out of 5 stars 207 Reviews | | Dry Time In Hours | 2 | | Finish Type | Matte | | Full Cure Time | 25 minutes | | Indoor Outdoor Usage | Indoor, Outdoor | | Is Waterproof | True | | Item Form | Aerosol | | Item Volume | 288 fluid ounces | | Manufacturer | Flywheel Distribution, LLC | | Paint Type | Spray | | Part Number | 342-1032-24 | | Size | 12 Ounce (Pack of 24) | | Special Feature | Chip Resistant, Fast-Drying | | Special Features | Chip Resistant, Fast-Drying | | Specific Uses For Product | Vehicle Undercoating, Car Undercoat, Truck Undercoating, Rust Prevention, Rust Preventive | | Surface Recommendation | Metal | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** Cosmoline Direct, LLC - **Color:** Black - **Finish Type:** Matte - **Size:** 12 Ounce (Pack of 24) - **Item Volume:** 288 Fluid Ounces - **Special Feature:** Chip Resistant, Fast-Drying - **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) 24-Cans - Image 1](https://m.media-amazon.com/images/I/51DyRGK+acL.jpg) ![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans - Image 2](https://m.media-amazon.com/images/I/41ve+zTW+gL.jpg) ![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans - Image 3](https://m.media-amazon.com/images/I/81N+IOwjdFL.jpg) ![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans - Image 4](https://m.media-amazon.com/images/I/71DhgsOzXSL.jpg) ![Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans - Image 5](https://m.media-amazon.com/images/I/815FX31EOfL.jpg) ## Available Options This product comes in different **Size** options. ## 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. ### ⭐⭐⭐⭐⭐ Awesome *by B***R on December 4, 2025* I wish I discovered this years ago. Lasts a long time and looks great. I’m done wasting time sanding under my truck and painting. It doesn’t last or protect as well as using Cosmoline. Came out awesome ### ⭐⭐⭐⭐⭐ 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. ## Frequently Bought Together - Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 24-Cans - Cosmoline RP-342 "Heavy" Rust Preventative Spray (Military-Grade) 24-Cans --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.ar/products/224934261-cosmoline-rp-342-black-rust-preventive-spray-military-grade-24](https://www.desertcart.com.ar/products/224934261-cosmoline-rp-342-black-rust-preventive-spray-military-grade-24) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-08-26*