SEALING COMPOUNDS
Preventing Leaks & Corrosion
PREVENTING LEAKS & CORROSION
Certain areas of aircraft are sealed to:
Preventing Fuel Leakage
Withstand Pressurization
Preventing Corrosion
Block Fumes
Most sealants consist of two or more ingredients properly proportioned and compounded. Some are ready for use as packaged, while others requiremixing before application.
TYPES OF SEALING COMPOUNDS
One-Part Sealants
Prepared by the manufacturer and ready for application as packaged. The consistency may be altered to suit a particular application method using the manufacturer-recommended thinner.
Two-Part Sealants
Require separate packaging toprevent cure prior to application:
- Base sealing compound
- Accelerator
Any alteration of the prescribed ratiosreduces the quality of the material.Typically combined by equal portions,by weight, of base compound andaccelerator.
TWO-PART SEALANT APPLICATION PROCESS
The curing rate varies with temperature and humidity. Ideal conditions are 77°F with 50% relative humidity for most sealants.
Preparation
Weighing
Mixing
Application
Testing
SEALANT CURING CONSIDERATIONS
Temperature Effects
- Curing is extremely slow below 60°F
- Heat can accelerate curing, but should never exceed 120°F
- Heat sources include infrared lamps or filtered heated air
Application Guidelines
- Heat should not be applied to the fraying surface sealant until all work is completed
- All attachments must be completed within the application limitations of the sealant
- Sealant must be cured to a tack-free condition before applying brush top coatings
Tack-free consistency is reached when a sheet of cellophane pressed onto the sealant no longer adheres.
SEALING COMPOUNDS
AMY SCHNEIDER
Created on September 25, 2025
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Transcript
SEALING COMPOUNDS
Preventing Leaks & Corrosion
PREVENTING LEAKS & CORROSION
Certain areas of aircraft are sealed to:
Preventing Fuel Leakage
Withstand Pressurization
Preventing Corrosion
Block Fumes
Most sealants consist of two or more ingredients properly proportioned and compounded. Some are ready for use as packaged, while others requiremixing before application.
TYPES OF SEALING COMPOUNDS
One-Part Sealants
Prepared by the manufacturer and ready for application as packaged. The consistency may be altered to suit a particular application method using the manufacturer-recommended thinner.
Two-Part Sealants
Require separate packaging toprevent cure prior to application:
Any alteration of the prescribed ratiosreduces the quality of the material.Typically combined by equal portions,by weight, of base compound andaccelerator.
TWO-PART SEALANT APPLICATION PROCESS
The curing rate varies with temperature and humidity. Ideal conditions are 77°F with 50% relative humidity for most sealants.
Preparation
Weighing
Mixing
Application
Testing
SEALANT CURING CONSIDERATIONS
Temperature Effects
Application Guidelines
Tack-free consistency is reached when a sheet of cellophane pressed onto the sealant no longer adheres.