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COMBO OFFER: RP-342 Aerosols (Mix & Match)

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  • Same Cosmoline RP-342 Protection - Different Coating Appearances - Clear Amber & Black Concealer
  • Cosmoline RP-342 BLACK Military-Grade Aerosol Spray Rust Preventive with 6" Extension Straw
  • Cosmoline RP-342 HEAVY Military-Grade Aerosol Spray Rust Preventive with 6" Extension Straw
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  • Cosmoline RP-342 Combination Offer - Same Protection - Different Coating Appearances - Clear Amber & Black Concealer
Ships UPS Ground (excluding HI & AK)
IN-STOCK. Ships Same Day (when order placed before 4:30pm EST).

COMBO OFFER: Cosmoline RP-342 Military-Grade Aerosols (Mix & Match)

These two bestselling aerosols are totally compatible.  The "Heavy" (orange can) is translucent with a slight amber tint only visible on light surfaces.  The "Black" is completely black, not translucent, and conceals the surface you coat.  When applying "BLACK" to VERTICAL SURFACES, 2 coats are recommended for the most uniform Black appearance.

HOW TO ORDER:  1.) Select the number of total cans you'd like to purchase (example: "6-pack").  2.) During the Checkout process, specify the number of cans of each (totaling the package size you're purchasing) in the "ORDER INSTRUCTIONS" field.     
Example purchasing a 6-pack:   4-Heavy, 2-Black (in order instructions field)    (4 cans of "Heavy" + 2 cans of "Black") = 6-Pack/Cans

Our Strongest, Longest-Lasting (and Fastest-Drying) Rust Preventive Aerosols, PERIOD!

   *  Offers the highest concentration of Industrial-Grade Cosmoline® available in a convenient Aerosol Can.
   *  1-coat protects all metals, iron, steel (stored Indoors or Outdoors) for Years!
   *  Our thickest, longest-lasting Rust Preventive Spray.
   *  RP-342 BLACK: - Produces a dry-to-the-touch, BLACK petroleum wax coating that CONCEALS unsightly blemishes or surface discoloration
   *  RP-342 HEAVY: - Produces a dry-to-the-touch, TRANSLUCENT (see-through) petroleum wax coating where surface coated can still be seen clearly.
   *  Faster-Drying formula allows for quicker handling and/or shipping.
   *  Withstands severe outdoor exposure, salt-laden atmospheres, acid & caustic fumes and other damaging environs.
   *  Repels water and will not wash off in salt water environments.
   *  Will not crack, craze, peel or flake and remains slightly flexible over time.
   *  Exceptional Vehicle Undercoating Product (Autos, Trucks, Buses, Trailers, etc.) - Road salt, debris and chemicals - No Problem!
   *  Aggressively adheres to imperfect surfaces and offers self-abraiding characteristics.
   *  Modeled after Military Specifications:  MIL-PRF-16173, Grade 4 and MIL-C-83933.
   *  Trusted since World War II.  Our Bestselling Aerosol - commercial customers, US Armed Forces, Government & Do-it-Yourselfers.
   *  Your Satisfaction with this product is Guaranteed!*

COMMON APPLICATIONS INCLUDE (but are not limited to):

   *  Vehicle undercarriage / undercoating (cars, buses, trucks, etc.) - See RP-342 Undercoating FAQs.
   *  Parts & equipment storage  
   *  Overseas transportation
   *  Heavy machinery & equipment
   *  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
   *  and any other surface or part that might rust on you... 

All aerosol cans come with 6-inch extension straws which allow you to apply product in hard-to-reach surfaces, crevices, gaps, cavities, etc.

VEHICLE UNDERCOATING USAGE APPROXIMATIONS (for thorough, heavy application):
Mid-Size Sedan:  6 Aerosol Cans for Undercarriage.  Add 3 Aerosol Cans for Inside Door Panels, Tailgate, etc..  (6-12 Total Cans)
Full-Size Truck:  9 Aerosol Cans for Undercarriage.  Add 3 Aerosol Cans for Inside Door Panels, Tailgate, etc..  (9-15 Total Cans)
* In both scenarios, you'll likely have an extra can or two.  However, it's better to have a little too much than run out.  


Make sure surface is reasonably clean and dry (not oily or greasy). Spray uniform coating.  For longer storage durations, a second coating can be applied if desired within 30 minutes.  Complete setting of protective coating takes approximately 1-2 hours after spraying.  Typical first application Dry Film Thickness is 2.0 Mils (51 Microns)
IMPORTANT When applying RP-342 "BLACK" to VERTICAL SURFACES and to ensure uniform BLACK coverage, (1) apply generous first coat, (2) let first coat dry completely, (3) apply a second coat as needed and let dry.

RP-342 can be easily removed with any over-the-counter petroleum solvent. Examples include mineral spirits, paint thinner, naphtha, diesel fuel, or our very own Cosmoline Remover.  Our Cosmoline Remover is very effective, but also considerably more expensive than the other options mentioned.

RP-342 is modeled after the following military specifications: MIL-PRF-16173E Grade 4, Class 1 and MIL-C-83933

* Certificates of Conformance are not available for this product. 

2 years when stored in reasonably prudent conditions (cool, dry, shaded).  Do not let cans get to freezing temperatures.

* Ozone Depleting Substances - Aerosol products were not manufactured, do not contain, and were not packaged using any Class 1 or Class 2 ozone depleting substances as defined by the clean air act.  
* Non-Chlorinated (no chlorinated solvents).

 Other Details

Specifiy the number of cans you'd like of "Heavy" & "Black" at Checkout in "Order Instructions" field.

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Cosmoline® and Rust-Veto® are registered trade names of Houghton International