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Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 1-Can

4.8 out of 5 stars 420 ratings

Price: $22.50
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Size: 1-Can
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  • 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.
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Frequently bought together

  • Cosmoline RP-342"Heavy" Rust Preventative Spray (Military-Grade) 1-Can
  • +
  • Cosmoline RP-342 Black Rust Preventive Spray (Military-Grade) 3-Cans
  • +
  • Rust-Oleum 248658A3 248658-3PK Rust Reformer Spray, 10.25 oz, Black, 3 Pack, 10.25 Ounce (Pack of 3), 3 Count
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Product description

Size:1-Can

Military-Grade Rust Prevention
Modeled 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!

Product details

Size:1-Can
  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Item Weight ‏ : ‎ 2 Pounds
  • Date First Available ‏ : ‎ November 30, 2016
  • Manufacturer ‏ : ‎ Cosmoline Direct
  • ASIN ‏ : ‎ B01MRRYF6N
  • Customer Reviews:
    4.8 out of 5 stars 420 ratings

Customer Questions & Answers

Customer reviews

4.8 out of 5 stars
4.8 out of 5
420 global ratings
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Top reviews from the United States

Reviewed in the United States on April 17, 2019
Size: 9-CansVerified Purchase
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5.0 out of 5 stars RP-342
By Motor Kada 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.
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61 people found this helpful
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Reviewed in the United States on November 2, 2019
Size: 12-CansVerified Purchase
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Reviewed in the United States on January 19, 2019
Size: 3-CansVerified Purchase
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Reviewed in the United States on May 29, 2020
Size: 6-CansVerified Purchase
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Reviewed in the United States on April 26, 2021
Size: 3-CansVerified Purchase
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Reviewed in the United States on April 2, 2019
Size: 6-CansVerified Purchase
17 people found this helpful
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Reviewed in the United States on September 18, 2017
Size: 12-CansVerified Purchase
24 people found this helpful
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Reviewed in the United States on March 5, 2017
Size: 3-CansVerified Purchase
36 people found this helpful
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