Few coatings carry as much mystique, or as many misconceptions, as CARC. Ask a defense contractor, a fabricator, and a procurement officer what CARC is, and you may hear everything from "that olive-green Army paint" to "the stuff you can't buy commercially." Each answer is partly right and mostly incomplete. CARC is not a color and it is not a single can of paint. It is a family of engineered coating systems built to a demanding set of military performance requirements.

CARC stands for Chemical Agent Resistant Coating, and it is governed today primarily by the U.S. military performance specification MIL-PRF-32348. Understanding what CARC actually is matters for a practical reason: it is frequently requested for parts that do not need it, and it is often specified without an appreciation for the certification, safety, and regulatory constraints that come attached. A finish that looks like CARC is not the same as a coating system qualified to perform like CARC.

In this guide we break down what CARC coating is, the jobs it is engineered to do, the layered anatomy of a CARC system, the meaning of MIL-PRF-32348 and the legacy specifications it consolidated, CARC's camouflage colors and infrared behavior, the safety realities of applying it, and how it compares to durable powder coating. We will also be candid about what Diamond Metal Finishing does and does not offer, so you can specify the right finish for the right part.

Key Takeaways

• CARC (Chemical Agent Resistant Coating) is a layered military coating system engineered so chemical warfare agents cannot absorb into it and can be decontaminated after exposure.
• Beyond chemical resistance, CARC is formulated to manage a vehicle's visual and near-infrared signature so it blends with terrain and defeats night-vision sensors.
• A CARC system is the complete stack of pretreatment, epoxy primer, and polyurethane topcoat, and it is the qualified system, not any single product, that carries the performance rating.
• MIL-PRF-32348 is a performance specification that consolidated older prescriptive CARC material specs and qualifies complete coating systems on a Qualified Products List.
• CARC polyurethane topcoats contain isocyanates and require certified applicators, supplied-air respirators, and controlled spray facilities, which is why CARC is a specialized service.
• Powder coating and CARC serve different purposes: powder coating delivers durable, decorative, low-VOC finishes but is not a qualified chemical-agent-resistant or infrared-managed military coating.
• Diamond Metal Finishing does not provide CARC and is not ITAR registered, but offers durable powder coating, chem film pretreatment, and other in-house finishes for non-CARC applications.

What Is CARC Coating?

CARC coating, explained in the simplest terms, is a specialized paint system developed for U.S. military ground vehicles and equipment so that chemical warfare agents cannot soak into the surface. On an ordinary painted finish, a liquid nerve or blister agent can penetrate the coating film and become nearly impossible to remove, turning the equipment itself into a lingering hazard. A chemical agent resistant coating is engineered to be non-porous and chemically inert enough that agents stay on the surface, where they can be neutralized and washed away with standard decontamination solutions.

The concept dates to the Cold War, when armies recognized that survivability on a contaminated battlefield depended not just on protecting soldiers but on making their equipment decontaminable. Since then, CARC has become the standard finish on tactical vehicles, trailers, generators, weapon systems, shelters, and countless smaller components across the U.S. armed forces and many allied militaries.

It is important to understand what CARC is not. It is not a brand, and it is not defined by its familiar matte green appearance. It is a performance category defined by military specifications. A coating earns the CARC designation only by passing a battery of qualification tests as a complete system, and only when applied over the correct pretreatment and primer. That system-level thinking is the key to everything that follows.

The Jobs a CARC Coating System Performs

CARC is often reduced to a single idea, chemical resistance, but a qualified system is asked to do several demanding things at once. Understanding these overlapping jobs explains why CARC is formulated and regulated the way it is.

• Chemical agent resistance and decontaminability: The topcoat resists penetration by liquid chemical warfare agents and by aggressive decontamination fluids such as DS2 and hot soapy water, so contaminated equipment can be cleaned and returned to service rather than abandoned.
• Infrared and visual signature management: CARC topcoats are formulated to reflect near-infrared light in a way that mimics natural vegetation and terrain, defeating image-intensifier night-vision devices, and they are applied at a lusterless sheen so equipment does not glint in sunlight.
• Environmental durability and corrosion protection: As part of a primer-plus-topcoat system, CARC provides weathering resistance, ultraviolet stability from its aliphatic polyurethane chemistry, and corrosion protection across extreme service conditions.
• Fuel, fluid, and abrasion resistance: The cured film stands up to fuels, oils, hydraulic fluids, and the mechanical wear that field equipment inevitably sees.

No single conventional finish delivers all of these properties together. That combination, chemical resistance layered on top of camouflage signature control and rugged durability, is precisely what makes CARC a distinct engineered system rather than just a color choice.

Anatomy of a CARC System: Pretreatment, Primer, and Topcoat

A CARC finish is built in layers, and each layer has a defined role. Skip or shortcut any one of them and the system is no longer CARC, regardless of what the top color looks like. Application is a controlled process, typically governed by application and quality-control specifications such as MIL-DTL-53072.

1. Surface preparation. Substrates are cleaned, degreased, and often abrasive-blasted to a specified profile so that the coating can mechanically and chemically bond. Contaminants, mill scale, and old coatings are removed to bare, sound metal.

2. Pretreatment or conversion coating. A chemical pretreatment is applied to promote adhesion and add a first line of corrosion defense. On aluminum this is commonly a chromate conversion coating; on steel it may be a phosphate or comparable treatment specified for the platform.

3. Epoxy primer. A corrosion-inhibiting epoxy primer, historically specified under documents such as MIL-DTL-53022 (solvent-borne) or MIL-DTL-53030 (water-reducible), is applied at a controlled film thickness. The primer carries much of the corrosion protection and anchors the topcoat.

4. Polyurethane topcoat. The CARC topcoat, an aliphatic polyurethane, provides the chemical agent resistance, infrared signature control, camouflage color, and lusterless sheen. This is the layer most people picture when they think of CARC.

5. Cure and inspection. The system is cured under controlled conditions and inspected for film thickness, adhesion, gloss, and color. Only the fully cured, correctly built system carries the CARC performance rating.

MIL-PRF-32348 Explained

MIL-PRF-32348, titled Coating Systems, Performance Requirements, is the specification that most current CARC procurement points to, and understanding it clears up much of the confusion around the topic. The critical clue is in the designation. The "PRF" marks it as a performance specification rather than a "DTL" detail specification. A detail spec tells a manufacturer exactly how to formulate a product; a performance spec defines what the finished coating must do and lets qualified formulations compete on results.

MIL-PRF-32348 was developed under the U.S. Army's coatings research organization to consolidate a sprawling collection of individual CARC material specifications into a single, system-level performance document. Instead of separately qualifying each primer and each topcoat by recipe, the specification qualifies complete coating systems, meaning a specific primer paired with a specific topcoat, that together pass the required tests. Systems that pass are listed on a Qualified Products List, or Qualified Products Database, and only listed combinations may be used.

Why the Performance-Based Approach Matters

• System qualification, not product qualification: Chemical agent resistance is verified on the actual primer-and-topcoat combination, because performance depends on how layers interact, not on any single can of paint.
• Room for innovation: Because it defines outcomes rather than chemistry, MIL-PRF-32348 lets suppliers introduce lower-emission or improved formulations as long as they meet the performance bar.
• Consistency of results: Buyers can specify a qualified system with confidence that it was tested for agent resistance, infrared reflectance, gloss, adhesion, and durability under a common standard.

When a drawing or purchase order calls out MIL-PRF-32348, it is calling for a qualified CARC system from the approved list, applied by the associated process requirements, not simply a color match.

Legacy CARC Specifications and How They Fit Together

Because CARC has evolved over decades, engineers still encounter a family of older specification numbers on legacy drawings. Knowing how they relate to MIL-PRF-32348 helps you interpret documentation accurately.

• MIL-DTL-64159: A water-dispersible aliphatic polyurethane CARC topcoat, developed to reduce solvent emissions compared with earlier solvent-borne products.
• MIL-DTL-53039: A single-component, solvent-borne aliphatic polyurethane CARC topcoat valued for field and touch-up application.
• MIL-DTL-46168 (formerly MIL-C-46168): An earlier two-component solvent-borne polyurethane CARC topcoat, one of the original workhorse formulations.
• MIL-DTL-53022 and MIL-DTL-53030: Corrosion-inhibiting epoxy primers, solvent-borne and water-reducible respectively, used beneath CARC topcoats.
• MIL-DTL-53072: The application and quality-control process specification that ties the layers together and defines inspection requirements, film thickness, and adhesion criteria.

From Detail Specs to a Performance Spec

The older detail specifications each described an individual product by composition and properties. MIL-PRF-32348 layered a performance-based, system-level framework over that landscape, qualifying primer-topcoat systems as complete units. In practice, older detail-spec products may still be referenced or remain qualified, but the modern trend is to specify the coating system through the performance specification and its Qualified Products List. If you inherit a drawing citing a legacy number, the safest path is to confirm the current qualification status and equivalent qualified system with the procuring authority before ordering.

CARC Colors, Gloss, and Camouflage Standards

The look of CARC is not cosmetic; it is engineered. Colors are drawn from federal color standards such as FED-STD-595, and the specific hues are chosen for camouflage effectiveness rather than aesthetics.

• Green 383: The familiar deep, muted forest green that serves as the base color for much U.S. tactical vehicle equipment and the woodland camouflage scheme.
• Brown 383 and Black: Combined with Green 383 to form the classic three-color woodland disruptive pattern.
• Tan 686A: The desert tan used widely for equipment operating in arid theaters.

Lusterless Gloss and Infrared Reflectance

Two properties set CARC apart from ordinary paint of the same color. First, combat items are finished lusterless, typically at a gloss near or below one on a sixty-degree gloss meter, so equipment does not reflect sunlight and reveal position. Second, and less visible to the naked eye, CARC topcoats are formulated to a controlled near-infrared reflectance curve that mimics natural foliage. Night-vision devices and infrared sensors see the world in wavelengths the human eye cannot; a coating that matches the terrain in the visible spectrum but glows in the infrared would be useless. CARC is tuned to blend in both. This is precisely why a commercial paint mixed to the same visible color is not CARC. It may match the eye, but without qualified chemical resistance and infrared behavior it fails the mission the specification exists to serve.

Health, Safety, and Why CARC Application Is Specialized

One of the biggest practical realities of CARC, and a major reason it is not a routine commercial offering, is worker safety. The aliphatic polyurethane topcoats are cured with isocyanate chemistry, and airborne isocyanates are potent respiratory sensitizers. Repeated or unprotected exposure can cause occupational asthma and lasting respiratory harm.

Because of this, spraying CARC is tightly controlled. Applicators typically work in dedicated, ventilated spray environments wearing supplied-air respirators, not ordinary cartridge masks, and facilities must manage overspray, air monitoring, and waste in accordance with strict health and environmental regulations. Personnel are usually required to complete formal CARC application and safety training and to maintain certification.

Legacy Hazards and Regulatory Change

Older CARC primers and coatings historically contained hexavalent chromium for corrosion inhibition and, further back, lead. Hexavalent chromium is a recognized carcinogen and is heavily regulated, which has driven the development of lower-toxicity, chromate-reduced, and water-reducible formulations qualified under modern specifications. This regulatory and safety burden is a defining feature of CARC. It is one reason the coating is generally applied at military depots and a limited number of specially equipped, qualified commercial facilities rather than offered as an off-the-shelf finishing option. There is also a broader compliance dimension: coating work on military platforms frequently involves export-controlled technical data under ITAR, which adds registration and handling obligations beyond the finishing process itself.

CARC Coating vs. Durable Powder Coating

Because both CARC and powder coating produce tough, matte, industrial-looking finishes, buyers sometimes ask whether one can substitute for the other. They are fundamentally different technologies built for different missions, and comparing them head to head clarifies when each belongs.

• Application method: CARC is a multi-component liquid system spray-applied in wet layers and chemically cured. Powder coating is a dry thermoset powder applied electrostatically and cured by heat into a continuous film.
• Primary purpose: CARC exists to resist chemical warfare agents and manage battlefield infrared and visual signature. Powder coating exists to deliver durable, attractive, corrosion-resistant protective and decorative finishes.
• Chemical agent resistance: CARC is qualified for it; standard powder coating is not, and should never be represented as chemical-agent resistant.
• Infrared signature control: CARC is tuned to a specified near-infrared reflectance; conventional powder coating is not qualified for infrared camouflage even when color and gloss appear similar.
• Color and gloss range: CARC uses a defined palette of camouflage colors at lusterless gloss. Powder coating offers a vast range of colors, sheens, and textures for commercial and industrial use.
• Environmental profile: Powder coating is solvent-free and low in volatile organic compounds, while CARC is a solvent- or water-borne isocyanate-cured liquid with the associated handling controls.
• Durability: Both are rugged. Powder coating provides excellent abrasion, impact, and corrosion resistance for demanding industrial service, but durability alone does not make it CARC.

The takeaway is straightforward. If a part genuinely requires qualified chemical agent resistance and managed infrared signature, only a qualified CARC system will do. If it needs a tough, good-looking, corrosion-resistant finish for industrial, commercial, or non-tactical use, powder coating is often the better and more economical choice.

Applications Across Industries

While CARC itself is a defense-specific system, the durable finishing services that surround it, and that Diamond Metal Finishing does provide, support a broad range of sectors that demand rugged, corrosion-resistant coatings.

• Defense & Military: Brackets, enclosures, nameplates, and non-tactical support hardware that need tough, low-gloss protective finishes outside of true CARC-qualified applications.
• Aerospace: Anodized and chromate-converted aluminum components requiring corrosion protection, controlled dimensions, and precise identification marking.
• Automotive & Transportation: Structural and cosmetic parts needing durable powder-coated finishes in custom colors and textures.
• Marine: Aluminum and steel hardware exposed to corrosive, high-humidity environments that benefit from conversion coatings and multi-coat powder systems.
• Oil & Gas / Energy: Rugged equipment and enclosures needing abrasion, chemical, and weather resistance for field service.
• Industrial / OEM: Production and prototype components requiring integrated finishing, from pretreatment through coating to permanent marking.

CARC and Durable Finishing Alternatives at Diamond Metal Finishing

We want to be direct on this point, because it matters for specifying your parts correctly. Diamond Metal Finishing does not provide CARC coating. CARC is a qualified, isocyanate-based military system that demands certified applicators, dedicated supplied-air spray facilities, and specialized regulatory handling, and it frequently involves ITAR-controlled technical data. DMF is ISO 9001:2015 certified but is not ITAR registered, and CARC application falls outside our scope of services. If your program requires a genuine MIL-PRF-32348 qualified system, you will need a CARC-certified applicator or military depot.

What we do offer is a full range of durable, in-house metal finishing for parts that need toughness and corrosion resistance without a CARC qualification requirement.

Durable Powder Coating

Our conveyorized, automated powder coating line finishes aluminum, steel, stainless, and galvanized parts up to 96 inches long by 60 inches high by 36 inches wide and up to 800 pounds per part. We stock standard colors and sheens from major brands, offer wrinkle, hammertone, and fine-texture finishes, and match custom Pantone and RAL colors. Gloss options range from roughly 10 to 90 percent, and specialty powders such as heat-resistant systems are available upon request. Films typically run 0.002 to 0.005 inch, with multi-coat primer-and-topcoat builds available for added protection. For components that do not require true CARC performance, this delivers a rugged, low-gloss, custom-colored finish.

Chem Film Pretreatment and Integrated Finishing

For aluminum, our chem film (chromate conversion) service per MIL-DTL-5541, Class 1A and Class 3, uses trivalent chemistry and serves as an excellent corrosion-resistant, RoHS and REACH compliant pretreatment and adhesion layer beneath powder coating. We also offer Type II and Type III anodizing per MIL-A-8625, laser engraving, and industrial screen printing, all under one roof, so a part can move from pretreatment through coating to permanent marking without leaving our Houston facility. Standard lead time is three to five business days, with expedite available, and there is no strict minimum order. A Certificate of Conformance is available for a fee.

Get Expert Metal Finishing Support in Houston, TX

Whether you are sorting out whether a part truly needs CARC or simply need a durable, corrosion-resistant finish done right, Diamond Metal Finishing can help you specify and produce the correct coating. From our facility at 5430 Brystone Drive in Houston, we serve customers across Texas, including Katy, Pasadena, Pearland, Sugar Land, The Woodlands, League City, Austin, San Antonio, Dallas, Fort Worth, El Paso, and Midland, with all work performed in-house. We handle prototype, small batch, and production volumes with a standard three-to-five-business-day lead time and expedite options when you are up against a deadline.

How Can You Request a Quote?

Send your drawings, part specifications, quantities, and finishing requirements to orders@diamondmf.com, or call us at (713) 903-3995. There is no strict minimum order. Tell us what the part does and the environment it will see, and we will recommend the right finish, powder coating, anodizing, chem film, or an integrated combination, and turn around a quote for your project.

Conclusion

CARC coating explained in full is far more than the muted green paint most people picture. It is a layered, qualified system of pretreatment, epoxy primer, and isocyanate-cured polyurethane topcoat, engineered to resist chemical warfare agents, control visual and infrared signature, and endure the harshest field conditions, all verified as a complete system under MIL-PRF-32348 and its family of legacy specifications. That system-level rigor, along with the real health, safety, and regulatory demands of applying it, is exactly why CARC is a specialized service rather than an off-the-shelf finish, and why a commercial paint matched to the same color is not a substitute. If your program requires genuine CARC, it belongs with a certified applicator or military depot. If your parts need rugged, corrosion-resistant, custom-colored protection without a CARC qualification, durable powder coating and integrated finishing are often the smarter, more economical answer. Diamond Metal Finishing is glad to help you tell the two apart and produce the finish your parts actually need.

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