Cosmoline rp-342

  • Close-up view of the underside of a vehicle showing parts of the chassis and metal components.

    Dependable.

  • Under the hood of a sports car showing a large white cover with a red 'TRD' logo, black and silver engine components, suspension, and grounding wires, with a snow-covered ground and a red building in the background.

    High-Quality.

  • Underneath a vehicle showing a black metal frame part of the car's chassis with some bolts and textured coatings.

    Trustworthy.

  • Underneath view of a car's exhaust system and metal components, including pipes and a heat shield.

    Robust.

  • Close-up view of the underside of a vehicle showing the suspension system, with a blue and red shock absorber, black chassis, and parts of the wheel and tire visible.

    Tough.

  • Underneath view of a vehicle's black coated chassis with a tires and suspension components, water droplets on the surface, in a garage with a red wall and spare tires in the background.

    Long-Lasting.

  • Underneath of a vehicle showing parts of the exhaust system, drivetrain, suspension, and chassis components.

    Magnificent.

  • Underneath view of a vehicle's chassis showing metal components, pipes, a chain, and part of the wheel.

    Durable.

  • View of the underside of a vehicle showing the exhaust system, differential, suspension, and wheels, with a snow-covered surface.

    Superb.

  • Underneath view of a vehicle showing exhaust pipes, suspension, and other mechanical components, with snow on the ground.

    Unyielding.

  • Close-up of a car engine component with bolts and a gasket, showing a shiny metallic surface.

    Resistant.

  • Close-up of a car's suspension system showing a coil spring, shock absorber, and drive axle components.

    Valuable.

  • Underneath view of a car's undercarriage showing the oil pan, suspension components, and exhaust system with some water droplets.

    Practical.

  • Underneath the vehicle showing parts of the exhaust system, metal tubing, and components with heat shielding and mounts.

    Strong.

  • Underneath view of a vehicle showing exhaust pipe, part of the chassis, and wheel with snow around.

    Resilient.

  • The underside of a Toyota TRD vehicle showing the engine and suspension components, with a snowy ground underneath.

    Heavy-Duty.

  • Underside of a vehicle showing the exhaust system and a black fuel or oil tank with insulation around it.

    Necessary.

  • Cosmoline RP-342 is a specialized version of the classic Cosmoline rust preventive compound; a waxy, petroleum based coating designed to provide exceptional protection against rust and corrosion. Known for its durability and foothold in military applications, RP-342 creates a robust, long-lasting barrier that prevents moisture, salt, and other corrosive elements from reaching metal surfaces. It is widely used in industrial, automotive, military, and marine applications to protect machinery, equipment, and vehicles from rust.

  • The protective film formed by Cosmoline RP-342 remains soft and pliable, ensuring long-term protection that doesn’t crack, peel, or wash away easily. This durability makes it ideal for protecting undercarriages, machinery, and metal components over extended periods in harsh environments.

  • Yes, Cosmoline is safe for use on all metal components of your vehicle's undercarriage. It is a non-rubberized/asphalt product, so it will not trap and seal moisture underneath. It adheres well to imperfect surfaces and does not crack, peel, or flake over time; it remains slightly flexible due to its waxy nature, accommodating the natural movements of your vehicle.

  • Unlike coatings that completely harden over time, Cosmoline RP-342 maintains a tacky consistency that allows it to self-heal minor abrasions. This feature helps maintain a continuous protective barrier even in high-impact areas.

  • Cosmoline RP-342 is designed to meet stringent military testing standards, including MIL-PRF-16173, Grade 4 and MIL-C-83933., which certifies its effectiveness for long-term rust and corrosion prevention. This makes it a trusted choice for military, government and industrial applications where performance is critical.

  • Cosmoline RP-342 is best suited for vehicles that are clean, dry, and free of rust. Here’s why:

    • Maximum Bonding: It adheres best to bare or primed metal with no corrosion. New vehicles offer the cleanest surface for long-term performance.

    • Dry Hard Shell: Cosmoline forms a fast-drying, durable wax coating. On rusted or flaky surfaces, it can lift or fail to seal properly.

    • No Creep Action: Unlike products like Woolwax® or Creep N’ Crawl, Cosmoline doesn’t migrate into seams or hidden areas. It needs a clean surface to be fully effective.

    • Long-Term Protection: It’s designed as a one-time application for new vehicles, offering multi-year rust prevention with little need for touch-up.

    If your vehicle has any rust, we recommend flexible, penetrating coatings like Woolwax for better adhesion, coverage, and durability.

  • Yes, Cosmoline can be removed with common petroleum-based solvents like mineral spirits.

  • No - the coating is lightweight and doesn’t significantly affect the weight or performance of your vehicle.

View of the underside of a vehicle, showing a black metal fuel tank along with some pipes and structural components.

cosmoline
rp-342

(undercarriage only - no body panels)

fully cured in 3 days

flexible wax barrier

Doesn’t trap moisture

Water & Salt Resistant

Mil-spec:
MIL-PRF-16173, Grade 4 and MIL-C-83933.

Up to a lifetime of protection

Turnaround time: 2 - 4 days

recommended for vehicles
with no rust or brand new

(We recommend Woolwax otherwise)

iNITIAL APPLICATION
starting at :

cars — $399
Suvs — $599
trucks — $799

(Any vehicle over 200” falls into truck pricing)

GET A QUOTE
Underside of a vehicle showing a protective metal shield, hydraulic lines, and parts of the suspension.

bronze
package

COsmoline undercoating:
2 layers of rp-342

cavity wax rustproofing

PROTECTION INSIDE AND OUT

1 hour mask/tape

for vehicles
with no rust or brand new

TURNAROUND TIME: 2 - 4 DAYS

10+ YearS OF
pROTECTION

starting at :

cars — $649
Suvs — $979
trucks — $1299

(Any vehicle over 200” falls into truck pricing,
BI-ANNUAL MAINTENANCE FOR WEAR/TEAR)

GET A QUOTE
Close-up of the underside of a vehicle showing a black oil pan and some pipe work.

silver
Package

eVERYTHING IN BRONZE PLUS:

ADDITIONAL LAYER OF RP-342
(3 LAYERS TOTAL)

BASIC UNDERCARRIAGE WASH

TURNAROUND TIME: 2 - 5 DAYS

12 - 15+ YEARS OF PROTECTION

starting at :

cars — $849
Suvs — $1279
trucks — $1749

(Any vehicle over 200” falls into truck pricing,
BI-ANNUAL MAINTENANCE FOR WEAR/TEAR)

GET A QUOTE
Close-up of the underside of a vehicle showing a differential, shock absorber, and part of a tire.

gold
package

eVERYTHING IN SILVER PLUS:

RUST PREVENTIVE
PAINT/PRIMER APPLICATION

STEAM CLEANING UNDERCARRIAGE WASH

TURNAROUND TIME: 3 - 5 DAYS

UP TO A LIFETIME OF PROTECTION

starting at :

cars — $1249
Suvs — $1779
trucks — $2449

(Any vehicle over 200” falls into truck pricing,
BI-ANNUAL MAINTENANCE FOR WEAR/TEAR)

GET A QUOTE

  • Wear and tear is natural to expect with any undercoating, which is exactly why we have a bi-annual maintenance plan starting at:

    Cars/sedans: $119
    Suv’s: $149
    Trucks: $199

    Required minimum of every 2 years to keep maintenance plan pricing.

your transformation awaits.

Practice Safe Driving Today, get an Estimate.