What are drying sealants and where are they used?

• A. Usually one part materials in either liquid or paste form. They cure to semi solid or solid state and have a wide range of applications, including air pressure sealing, component sealing, moisture ingress areas and seal/gasket manufacture.
• B. They require heat to cure.
• C. They are two-part and cure with moisture.
• D. They are used only for fuel containment.

Answer: (A)

Drying sealants are single-component materials that cure by drying or solvent evaporation, not by mixing or applying heat. They come as liquids or pastes and harden into a flexible semi-solid or solid film without the need for a curing agent or moisture to initiate reaction. This makes them convenient for everyday use in aviation maintenance.

They have a wide range of applications because they can form effective seals in various situations: sealing joints and seams to maintain air pressure, sealing between components to prevent leaks, protecting areas from moisture ingress, and even being formed into gasket-like shapes during manufacture. This versatility is why they’re described as suitable for air pressure sealing, component sealing, moisture ingress areas, and seal/gasket manufacture. They’re distinct from two-part, moisture-curing, or heat-curing sealants, which require mixing, moisture, or heat to cure and therefore serve different needs.