PPG Deft 99-GY-031 Flat Gray MIL-PRF-85285E Topcoat – Gallon Kit for Military Aircraft
PPG Aerospace Deft 99-GY-031 is a flat gray (FS#36293) MIL-PRF-85285E Type I, Class H qualified aerospace polyurethane topcoat in gallon kit format, used on military aircraft requiring the specific FS#36293 gray color per applicable technical orders. FS#36293 is one of several standard flat gray designations used across U.S. military services in tactical aircraft paint schemes — a slightly different shade than FS#36622 — used on specific aircraft types and paint scheme variants per the applicable aircraft technical order.
The gallon kit is the standard production format for military painting operations, providing sufficient material for painting significant structural surface areas during scheduled maintenance paint events. The gallon format balances material economy with manageable mixing batch size for the typical daily painting throughput of military paint shop operations.
Deft 99-GY-031 provides all the performance attributes of MIL-PRF-85285E topcoats — outstanding aliphatic polyurethane UV stability, chemical resistance to military aircraft fluids, flexibility for long-term crack resistance on airframe panels, and the flat matte appearance of FS#36293 that reduces reflective signature on tactical military aircraft.
| Attribute | Detail |
|---|---|
| MPN | DE99GY031FS#36293 |
| Brand | PPG Aerospace / Deft |
| Product | Deft 99-GY-031 |
| Color | Flat Gray FS#36293 |
| Type | Two-Component Aerospace Polyurethane Topcoat |
| Size | Gallon Kit |
| Specification | MIL-PRF-85285E Type I, Class H |
| Surfaces | Military Aircraft, Helicopters, Defense Equipment |
| Application | Spray Application |
| Industry | Aerospace, Military, Defense, Depot MRO |
Technical Information
Deft 99-GY-031 uses the same two-component aliphatic polyurethane chemistry as other Deft MIL-PRF-85285E topcoats — aliphatic isocyanate hardener and hydroxyl-functional polyol base — producing a UV-stable, color-retaining flat gray coating with excellent adhesion over military aerospace primers, high flexibility, and chemical resistance to jet fuels, hydraulic fluids, deicing agents, and cleaning solvents. The FS#36293 color formulation is maintained to the Federal Standard 595 specification for reproducible batch-to-batch color consistency.
The distinction between FS#36293 and other flat gray Federal Standard colors (such as FS#36622) is subtle but important — aircraft paint specifications require specific FS color codes, and using a neighboring gray shade that does not match the specified code can result in an out-of-specification paint condition discovered during paint inspection. Verify the correct FS color code for the aircraft being painted against the applicable technical order before selecting coating materials.
The 2-component gallon kit must be mixed at the correct ratio. The mixed adhesive has a defined pot life — apply within the pot life and discard any remaining mixed material after the pot life expires. Do not use expired mixed coating, as the isocyanate-polyol reaction continues after pot life, resulting in a gelled coating with poor application and film properties.
Why Choose Deft 99-GY-031?
- ✅ MIL-PRF-85285E Qualified — Premier military polyurethane topcoat spec
- ✅ FS#36293 Flat Gray — Specific military tactical gray color
- ✅ UV Stable Aliphatic PU — Long-term color and appearance retention
- ✅ Gallon Kit — Standard production format for military paint shops
- ✅ PPG Deft Trusted Quality — Decades of military aerospace coating supply
Applications
Deft 99-GY-031 is used for painting military aircraft requiring FS#36293 flat gray per applicable technical orders during scheduled paint events, depot maintenance repainting, and repair zone restoration.
Frequently Asked Questions
Q: What is PPG Deft 99-GY-031?
A: 99-GY-031 is a flat gray FS#36293 MIL-PRF-85285E Type I, Class H aerospace polyurethane topcoat for military aircraft requiring the specific FS#36293 gray color.
Q: MPN for Deft 99-GY-031 gallon?
A: MPN is DE99GY031FS#36293.
Q: What is FS#36293?
A: FS#36293 is a Federal Standard 595 flat gray color designation. It is a specific gray shade different from FS#36622 — both are used on military aircraft, with the specific code determined by the aircraft’s applicable technical order.
Q: How is FS#36293 different from FS#36622?
A: FS#36293 and FS#36622 are different shades of flat gray per Federal Standard 595. The specific code required depends on the aircraft’s paint scheme technical order. Always verify the correct FS code before selecting coating.
Q: Is a primer required before Deft 99-GY-031?
A: Yes. Apply an approved corrosion-inhibiting primer (MIL-PRF-23377 or MIL-PRF-85582) before applying the topcoat. Consult the applicable military technical order for the required primer system.
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