Protect Your Fleet: The Essential Buyer’s Guide to PPG Corrosion-Inhibiting Sealants
Maintenance is the first line of defense for aircraft. These multimillion-dollar machines rely heavily on sealants and compounds to keep them corrosion-free and operating at peak capacity. Corrosion impacts structural integrity, increases fatigue life, and decreases aerodynamic efficiency. Maintenance costs are among the highest for aircraft throughout their lifecycle, so using the right chemicals and sealants is the best proactive measure you can take to keep costs down and MC rates up.
PPG is a trusted manufacturer of corrosion-inhibiting sealants, and Greenwood Aerospace is the exclusive provider of PPG products via GSA Advantage. We chose to do this because it is the simplest and fastest way to source and buy consumable aircraft products.
What Are Corrosion-Inhibiting Sealants & Jointing Compounds?
So, what are jointing compounds anyway? Jointing compounds are a common adhesive used across myriad industries. Of course, they are not the same materials, but the concept is the same thing.
When used on metal structures and surfaces, it is a corrosion-inhibiting compound generally applied between dissimilar metals to prevent galvanic corrosion, moisture ingress, and degradation from fuel, water, and environmental exposure.
Does Curing Versus Non-Curing Matter?
Performance Attributes
The materials are engineered to:
- Be a barrier against fuels/chemicals, water, and salt
- Prevent galvanic corrosion in aluminum assemblies and between dissimilar metals
- To withstand prolonged fuel exposure
- Form a non-hardening (think epoxy) corrosion shielding layer
- Support long-term fleet health in all operating conditions and climates
PPG Product Family Overview
Understanding CA-Series Products
PPG CA-Series jointing compounds are commonly used non-chromate corrosion-inhibiting protective substances used for joining parts in critical structures and fuel systems. These compounds are formulated as single-component thixotropic pastes that apply easily with a brush or spatula and remain permanently masticable; they will flex and maintain protection without curing.
Designed to withstand prolonged exposure to jet fuel and aviation gasoline, CA-Series materials are perfect for lap joints, fuel bay interfaces, and wet-wing structures where re-entry and inspection are common. Because they never harden, maintainers can reopen fastened assemblies without removing and replacing material, a big plus for high-cycle fleets and platforms with recurring inspection intervals. CA-Series should be specified when a non-chromate solution is required, when long-term access to joints or fasteners is needed or when OEM engineering requires NCCI jointing compounds.
Understanding Mastinox Jointing Compounds
Mastinox is a widely used fastener-interface corrosion inhibitor compound used across all fleets, both commercial and military.
Core advantages:
- Chromate-based aerospace anti-corrosion chemistry
- Superior barrier protection for dissimilar metals
- Thixotropic paste for easy brush application
- Proven compatibility with steel, titanium, and aluminum
- Remains mastic under prolonged fuel exposure
- Performs in extreme environments from −65°F to 320°F
It is ideally used for:
- Spar caps and fastener bores
- Lap joints and structural seams
- High-stress mixed-metal assemblies
See the detailed Mastinox buyer’s guide!
Benefits & Mission Value for Aviation Programs
What is the value in applying PPG corrosion-inhibiting compounds?
PPG corrosion-inhibiting sealants and jointing compounds protect the most sensitive (and some of the most costly) areas of every aircraft. Maintaining seal integrity in high-stress environments directly contributes to fleet health and readiness.
Their use contributes to long-term structural integrity throughout the aircraft's lifecycle, improves MTBF performance, and reduces long-term sustainment and lifecycle costs. From rotary-wing fleets flying in high-salt ocean environments to high-cycle transportation fleets operating at all ends of the earth, mastic sealants enhance mission continuity and total-force readiness by conserving critical airframe and fuel tank interfaces.
Application, Compatibility & Maintenance Environments
These products are ideally suited for wet wings and fuel cells, lap joints and fastener interfaces, and access panels or removable structures. You definitely want these products in corrosive coastal bases, but you should use them at all locations.
Selection Factors for Government Procurement
The selection process for all chemicals in government procurement always begins by ensuring that the sealants, lubricants, and the like are approved for the unit’s aircraft. This will be sourced from the OEM technical publications for civil aircraft and proper technical data for military aircraft.
Determining whether it will be chromate or non-chromate is important, as they are not universal, as expected fuel exposure, re-entry frequency, and temperature ranges determine which PPG product to source.
Procurement specialists also need to factor in packaging requirements, bulk buys, storage conditions, and shelf-life management, especially for high-ops-tempo organizations and depot-level organizations, where material rotation and inspection cycles are frequent and large volumes of material are used.
For large-order inquiries or to confirm product availability, reach out to Greenwood Aerospace at gsasales@greenwood.aero or call us at 580-865-6000 or 833-GSA-EBUY (833-472-3289). We will ensure you have access to bulk materials for all PPG aerospace products in our catalog.
When contracting specialists initiate the purchase process, contracting teams must note the SKU, NSN, or GSA product reference number (as applicable), check the packaging (tins, tubes, cartridges), and confirm that it meets all OEM technical requirements.
They also need to plan for any delivery time issues from the GSA. Greenwood Aerospace is here to help with all that: buyers pick the right products for the job, stay compliant, and ensure they can continue to obtain critical corrosion-defense materials for government vehicles without any interruption in supply.
Purchasing Through GSA & Government Channels
When it comes to sourcing PPG Aerospace corrosion-inhibiting compounds and jointing materials, Greenwood Aerospace is the trusted, government-ready procurement partner federal fleets rely on. As an authorized supplier with deep experience supporting defense programs, OEM service centers, and federal aviation units, Greenwood streamlines operations, ensures compliance, and accelerates PPG sealant acquisition.
Our team understands shelf-life controls, packaging requirements, MIL and AMS callouts, and government contracting workflows: from GSA Advantage ordering to bulk stock programs and emergency field resupply. Whether you need individual cartridges for squadron-level maintenance or pallet-level stocking for depot sustainment, Greenwood is positioned to deliver with precision and speed.
For GSA Advantage buyers, Greenwood Aerospace already stocks essential PPG PRC-DeSoto corrosion-inhibitive materials ready for immediate procurement. These include:
These approved corrosion-control materials are compliant, in-stock, and available for efficient government purchase, and they are just a small part of the full suite of PPG PRC-DeSoto aerospace products Greenwood supplies.
With turnkey logistics support, compliant packaging and shelf-life management, and rapid fulfillment capabilities, Greenwood ensures sustainment programs, squadron maintenance units, and depot operations have dependable access to mission-critical PPG products when they need them most. Simply put, if your team is specifying CA-Series compounds, Mastinox, or PR-Series fuel-tank sealants, Greenwood Aerospace is the go-to U.S. government sourcing solution for PPG materials and other aviation consumables.
Final Thoughts: Long-Term Protection with PPG Aerospace Corrosion-Inhibitive Compounds
Corrosion inhibition is one of the most important maintenance disciplines in all of aircraft maintenance. There is no box-swapping and component-pulling here; when corrosion strikes, the entire airframe is at risk, and you cannot just pull off a part and swap it out.
Corrosion-inhibiting sealants and jointing compounds are important tools in the fight against corrosion. PPG’s CA-Series, Mastinox, and PR-Series products provide trusted protection where it counts, when it counts. By combining field-proven performance with MIL/AMS compliance and broad OEM acceptance, PPG corrosion inhibitors and jointing compounds give your MRO and maintenance teams the long-term airworthiness solution they need, with a procurement process that is fast, simple, and ready to ship with no contract obligations, no negotiations, and no long-term contracts. Just click buy on the links, and we ship it.
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