PPG PR-1436-GPT Sprayable Corrosion Sealant: Specs & GSA Procurement Guide

This article is part of our multi-article series on PPG corrosion-inhibiting sealants and aerospace coatings, following our detailed guide on when and why to use PR-1436-GPT in federal aviation programs. Each entry in this series aims to help government buyers, aviation engineers, and sustainment managers understand PPG’s corrosion-control products, their applications, and how to procure them in compliance with GSA Advantage.

Federal aviation and defense programs continue to modernize, and PPG PR-1436-GPT remains one of the most dependable options for spray-applied corrosion protection in jet and turbine aircraft. Designed for internal cavities, structural bays, and dissimilar-metal interfaces throughout the aircraft, this sprayable corrosion-inhibitive sealant provides long-term durability.

We are taking a look at exactly how and where PPG PR-1436-GPT is used, why you should use it, and the exact procurement method to get it into your hands fast. 

When aircraft components need to endure tough environments, the PR-1436-GPT sealant performs. Rated for use from –65 °F to 225 °F (with brief spikes up to 250 °F), it is designed as a two-part, sprayable corrosion-inhibitive barrier for aluminum alloys and dissimilar-metal joints. Buy now through GSA Advantage!

A Sprayable Sealant Engineered for Aerospace Performance

PR-1436-GPT, also known as PR-1436-G Sprayable, is a two-part system consisting of a base and a curing agent that creates a polysulfide sealant. This sealant is meant to be sprayed, giving it a much broader range of applications than traditional brush- or spatula-applied products like CA1000 and Mastinox D40.

Before mixing, the material is just a base and curing agent, but once combined, something interesting happens: you get a sprayable mixture that can be applied with a pressure pot system or some of the specialized Semco spray equipment. The great thing about this mixture, while still uncured, is that it flows smoothly and evenly—just apply a coat of the attractive aluminum gray finish, and it looks excellent whether covering a large area or a detailed piece of metalwork.

Now, once it's had a chance to cure at room temperature, PR-1436-GPT transforms into a flexible, rubber-like barrier that adheres well to all sorts of metals, such as aluminum, magnesium, and titanium, and to any mix of metals. It's perfect for aircraft—fixed-wing and rotary-wing; in fact, it's precisely correct for all those areas where you need to keep moisture out and prevent corrosion from taking hold.

The good news is that PR-1436-GPT has been qualified to the exacting standards set by MIL-PRF-81733 Type III-1. Which means it's been thoroughly tested and has passed with flying colors—it's the real deal for high-reliability applications in the aerospace industry and in any other area where performance is critical and can't be compromised.

Key Specs and Performance Characteristics

Considering the extreme environments it operates in, PR-1436-GPT is engineered to deliver a balance of durability, flexibility, and long-term resistance to all environmental conditions that an airplane can ever face. 

All properties listed are taken directly from the PPG PR-1436-G TDS. 

Temperature & Environmental Performance

Service range: −65°F (−54°C) to 225°F (107°C)

Intermittent temperature excursions: Up to 250°F (121°C)

This broad window is important because modern turbine aircraft operate in all conditions from the Arctic to the deserts of Southwest Asia, and sometimes experience them on the same day! 

During cold weather testing at −65°F, PR-1436-GPT exhibits no cracking, checking, or adhesion loss. This confirms it as a suitable agent for extreme-cold operations, which the military has numerous arctic or extreme-cold flight operations, as does the federal government. 

On the opposite end of the spectrum, PR-1436-GPT maintains flexibility and adhesion after repeated heat cycles and delivers reliable, consistent performance during high-heat applications. 

Fuel, Chemical & Hydraulic Fluid Resistance

  • Jet fuel hydrocarbon resistance: ~6% weight loss after 7 days at 140°F
  • Hydraulic fluid resistance: Retains adhesion after Skydrol 500 immersion at 120°F

Fuel tanks and wet-wing structures subject coatings and sealants to intense chemical strain, and PR-1436-GPT is engineered to meet those demands. After a week submerged in hot fuel, the sealant showed minimal weight loss, a key indicator of long-term stability within tank structures. 

Its compatibility with Skydrol 500, one of the most aggressive hydraulic fluids in aviation, further validates its suitability for use near hydraulic reservoirs, tubing manifolds, and system enclosures.

Mechanical Properties

  • Shear strength: 250 psi
  • Tensile strength: 350 psi
  • Elongation: 175%
  • Hardness: Shore A 50

These metrics indicate a sealant engineered for maximum vibration resistance and fuselage flexing, with dynamic interfaces. Aircraft structures are under constant stress from factors such as pressurization cycles, turbulence, flap and aileron actuation, and even landing impact. 

The elongation rate of 175% allows for the cured film to remain intact even under dynamic load. 

Film & Material Characteristics

Recommended dry film thickness: 5–8 mils

Nonvolatile content: ~66%

Fungus resistance: Non-nutrient formulation

The manufacturer-recommended film thickness is optimized to achieve the best balance of coverage, curing consistency, and spray efficiency. Since it uses a non-nutrient chemistry, it prevents all microbial growth, an imperative attribute for aircraft that operate in warm, high-humidity environments. 

GSA Advantage Access & Procurement Support

Federal agencies can purchase PR-1436-GPT directly through GSA Advantage, ensuring compliant procurement, predictable pricing, and a minimized administrative burden.

GSA Listing: PPG PR-1436-GPT on GSA Advantage

Greenwood Aerospace is a trusted distributor of PPG Aerospace sealants, lubricants, tapes, and specialty materials, supporting DoD aviation programs, DHS and DOJ air fleets, federal law-enforcement aviation, NOAA, FAA, and other civil and federal aircraft, as well as prime contractors and integrators. 

With AS9120B quality system certification, ITAR registration, and decades of government logistics experience, Greenwood provides rapid fulfillment, accurate documentation, and direct support to program offices seeking technical clarification or stock verification. Whether a program requires a single kit, bulk procurement, or multi-aircraft sustainment planning, Greenwood ensures an efficient, compliant acquisition process.

Final Thoughts

This article is part of our broader PPG Aerospace CI Sealant Series, which includes in-depth guides on CA1000, CA1010, Mastinox D40, the PR17XX Series of sealants, and multiple articles focused on PR-1436-GPT procurement and application. Together, these resources help government buyers, aviation program offices, and maintainers identify the correct sealant for each structural situation—while also ensuring procurement remains smooth, compliant, and well-supported through GSA Advantage.

PR-1436-GPT remains one of the most versatile, durable, and application-flexible sprayable corrosion-inhibitive sealants in the federal aviation environment. Its proven chemical resistance, mechanical stability, temperature tolerance, and MIL-PRF-81733 qualification make it indispensable across modern sustainment operations.

With reliable availability through GSA and comprehensive procurement support from Greenwood Aerospace, PR-1436-GPT continues to play an essential role in protecting aircraft structures, improving long-term readiness, and reducing lifecycle costs across the federal aviation enterprise.