--- product_id: 741217087 title: "Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans" brand: "buto" price: "฿20554" currency: THB in_stock: true category: "Buto" url: https://www.desertcart.co.th/products/741217087-cosmoline-rp-342-black-rust-preventive-spray-military-grade-6 store_origin: TH region: Thailand --- # Resists salt spray & harsh elements Dries in 25 minutes Military-grade rust protection Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans **Brand:** buto **Price:** ฿20554 **Availability:** ✅ In Stock ## Summary > 🛡️ Protect like a pro, dry in a flash, and never look back! ## Quick Answers - **What is this?** Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 6-Cans by buto - **How much does it cost?** ฿20554 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/741217087-cosmoline-rp-342-black-rust-preventive-spray-military-grade-6) ## Best For - buto enthusiasts ## Why This Product - Trusted buto brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Fast-Dry Formula:** Get back to work in under 30 minutes—no waiting, no hassle. - • **Sleek Black Finish:** Conceals imperfections with a smooth, glossy petroleum wax coating that won’t crack or peel. - • **Long-Lasting Shield:** One coat guards metal surfaces for years against rust, salt, and chemicals. - • **Effortless Application:** Spray on dry surfaces and done—no mess, no fuss, just reliable rust prevention. - • **Military-Grade Durability:** Trusted by the U.S. Armed Forces for decades—ultimate protection you can rely on. ## Overview Cosmoline RP-342 is a military-grade, black petroleum wax rust preventive spray that dries in 25 minutes and provides years of durable protection against rust, salt spray, and harsh environments. Trusted since WWII, it offers a sleek, non-tacky finish that won’t crack or wash off, making it ideal for vehicle undercoating and industrial use. ## 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 | |---------------|-------| | ASIN | B0888PB5G7 | | ASIN | B0888PB5G7 | | Age Range Description | Adult | | Brand Name | BUTO | | Color | Black | | Container Type | Can | | Date First Available | 24 June 2025 | | Finish Type | Gloss | | Indoor Outdoor Usage | Outdoor | | Item Form | Aerosol | | Item model number | RP-342 | | Manufacturer | Flywheel Distribution, LLC | | Manufacturer | Flywheel Distribution, LLC | | Model Name | RP-342 | | Model Number | RP-342 | | Paint Type | Spray | | Part Number | 342-1032-6 | | Product Dimensions | 13 x 16.2 x 25 cm; 3.18 kg | | Size | 12 Ounce (Pack of 6) | | Special Features | Washable | | Specific Uses For Product | Vehicle Undercoating, Car Undercoat, Truck Undercoating, Rust Prevention, Rust Preventive | | Surface Recommendation | Metal | | Unit Count | 72 Grams | ## Product Details - **Brand:** BUTO - **Colour:** Black - **Finish type:** Gloss - **Size:** 12 Ounce (Pack of 6) - **Special features:** Washable ## 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) ## 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) 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 --- ## 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.co.th/products/741217087-cosmoline-rp-342-black-rust-preventive-spray-military-grade-6](https://www.desertcart.co.th/products/741217087-cosmoline-rp-342-black-rust-preventive-spray-military-grade-6) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-05-30*