High-Volume Consumables for Depot Maintenance: Adhesives, Sealants, and Abrasives Stock Guide 2026

Phase, Iso, and Depot-level maintenance are a different ballgame than line maintenance. Line maintenance is definitely real maintenance, but it is a fast-paced environment where the workload is dictated by flight operations. 

Phase, Iso, and depot are still fast-paced, but in a different way. It is a speed shaped by the entire project, which involves a major teardown of the aircraft to expose problems. Even if the pace is relatively fast, it is still a process that takes weeks or even months to complete. Since the aircraft is guaranteed to be down for inspection and maintenance for a while, this is an ideal time for compliance with technical orders or their civilian counterparts, STCs or ADs. It is also prime time to replace or repair sealants and adhesives that take time to cure as part of PMs. 

Accordingly, these maintenance levels go through a lot of consumables. We’re going to walk through a few common consumables your team needs you to stock up on in 2026 to sustain and increase the flight operations tempo. 

Why Depot-Level Stocking Is Different

Phase and ISO are intermediate-level maintenance, but even then, they are far less intense than working in a maintenance depot where the airplane is largely stripped down. Depot maintenance can easily take six months to complete, depending on the airframe and any required TCTOs. 

Depot teams use an excessive amount of consumables to restore these aircraft to like-new condition. 

What Makes a Consumable “Depot-Level”

Depot-level consumables are defined by high burn rates across multiple aircraft and maintenance phases, with bulk or case-stackable packaging to reduce restocking frequency. Long shelf life and storage stability are key, as is repeat use across structural bonding, sealing, and refurbishment tasks. 

Products designed for specialty or single-use applications don’t scale well in depot environments, so volume-friendly formats and consistent performance are key selection criteria.

Structural Adhesives for Heavy Maintenance and Rebuild Cycles

Structural adhesives play a critical role throughout the teardown, repair, and reassembly phases of depot-level maintenance, supporting both composite and metal-bonding operations identified during inspection. 

These adhesives must perform reliably across a wide range of repair scenarios while remaining available in sufficient quantities to prevent workflow interruptions. Bulk packaging formats help reduce downtime, minimize inefficiencies from repeated mixing, and support continuous repair operations.

AkzoNobel 10P20: Structural Epoxy Adhesive Primer

Let’s start with a structural adhesive, the AkzoNobel 10P20 epoxy primer. Depot maintenance goes through a lot of primer, so buying in bulk from Greenwood Aerospace is a great option to keep in stock. 10P20-13 is a low-VOC two-component epoxy primer with excellent corrosion resistance and good flexibility and chemical resistance. 

ADTECH Plastic Systems 15-3 Epoxy Adhesive

ADTECH Plastic Systems 15-3 (Micro-Ultra 15-3) is a fast-set, lightweight filler paste for aerospace composite repair and surface finishing where flame resistance, low added weight, and finish quality are critical. This rigid, low-density polyester system meets FAR 25.853a flame requirements and is 30-35% lighter than traditional fillers. Ideal for interior composite repairs during heavy maintenance and overhaul cycles. 

This filler paste adheres to fiberglass, FRP, graphite, Kevlar, SMC, and BMC substrates and resists vibration, impact, and common aircraft cleaning solutions. The reaction takes 4-8 minutes to complete at room temperature. Stocking quart kit case quantities allows depots to be ready for porosity filling, surface defect repair, edge fill, and structural reinforcement without overcommitting material or wasting time in critical maintenance environments.

Sealants That Support Long Induction Schedules

Sealants make or break reliability, especially for systems as sensitive as the fuel cells, where there is no room for errors or second-best. 

AkzoNobel 454-4-1 – Polysulfide Sealant

AkzoNobel 454-4-1 is a chemically cured, two-part polysulfide sealant qualified for integral fuel tank and internal structural sealing applications. It is long-term resistant to aviation fuels, hydraulic fluids (including Skydrol), and corrosion-causing media, making it a great choice for depot-level bulk stocking. 

An 8-hour pot life at room temperature and controlled induction characteristics means you can apply across multiple aircraft without performance drift. Broad OEM approvals and a predictable cure profile make it perfect for high-volume maintenance programs where consistency, repeatability, and fuel system integrity are key.

AV-DEC ThixoFlex TG3212

AV-DEC ThixoFlex TG3212 is a high-vibration sealant commonly used in dynamic aircraft areas, including nacelles, access panels, and fairings. Although packaged in cartridges, its high usage rate justifies case-level stocking to ensure uninterrupted maintenance during overhaul activities.

Be sure to buy plenty of this because you will go through a lot!

Interior & Refurbishment Adhesives Often Overlooked in Depot Planning

The interior of military aircraft takes a beating and is usually removed during extended inspection cycles, such as phase and depot.

Bostik 7132 Vinyl Adhesive

Bostik 7132 (L7132K) is a two-part, solvent-based thermoset vinyl adhesive for bonding aerospace interior panels and insulation. It has high green strength and excellent adhesion to vinyl films, polyolefin foams, aluminum, honeycomb panels, and composite interior substrates for efficient reassembly during depot-level refurbishment. 

The wide processing window and predictable cure allow maintainers to maintain a consistent workflow across large interior modification or overhaul projects. Supplied in one-gallon kits, Bostik 7132 is ideal for high-volume interior bonding applications requiring durability, heat resistance, and repeatable bond performance.

How to Think About Depot-Level Consumable Stocking

Stocking supply points at depots and other high-level, highly in-depth maintenance points is a delicate balance. You need plenty for the task at hand, but you must also make sure your products in stock are routinely rotated so they do not expire. 

Procurement Considerations for Government & Military Depots

Greenwood Aerospace is firmly committed to getting you what you need and doing it in the most streamlined, fastest way possible. The GSA Schedule is a wonderful tool for streamlining procurement for military and federal procurement officers, and end users alike.

The end user can easily identify items to source with a guaranteed price, and procurement officers love the simple buying process. Find the item, decide the quantity, and place the order. It’s that simple. 

Final Takeaway: Stocking for Throughput, Not Convenience

Depot-level overhaul environments demand consumable strategies built around continuous use rather than convenience or one-off repairs. Buying core adhesives and sealants is critical to protecting overhaul schedules, reducing delays, and minimizing rework. 

Smart stocking decisions ultimately support smoother inductions, more predictable maintenance timelines, and improved operational outcomes. Your team relies on you to source the products they need and keep them supplied throughout every maintenance cycle. 

Greenwood Aerospace is your trusted source for aircraft maintenance and repair consumables, with nearly 1,000 items listed on GSA Advantage, with more on the way!

As a U.S. Department of State ITAR-registered company, Greenwood Aerospace is fully certified to support defense and government contracting requirements. We maintain an AS9120B Quality Management System and ITAR DDTC Export Compliance.

GSA Multiple Award Schedule (MAS) Contract: 47QSMS25D00B8

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Need help with product availability, bulk orders, or expedited shipping? Contact us at gsasales@greenwood.aero or call 580-865-6000 / 833-GSA-EBUY (833-472-3289).