What is the standard exterior protective coating for aircraft surfaces per MIL-C-85285?

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Multiple Choice

What is the standard exterior protective coating for aircraft surfaces per MIL-C-85285?

Explanation:
The standard exterior protective coating for aircraft surfaces under MIL-C-85285 is an aliphatic polyurethane topcoat. Aliphatic polyurethane provides superior UV resistance, color stability, and durable weathering performance, which are essential for protecting aircraft exposed to sunlight and the elements over long periods. Primers like epoxy or zinc chromate are used as undercoats to provide corrosion protection, but they are not the exterior finish specified by this MIL-C standard. Acrylic enamel has historical use but doesn’t meet the long-term UV durability and performance of aliphatic polyurethane specified here.

The standard exterior protective coating for aircraft surfaces under MIL-C-85285 is an aliphatic polyurethane topcoat. Aliphatic polyurethane provides superior UV resistance, color stability, and durable weathering performance, which are essential for protecting aircraft exposed to sunlight and the elements over long periods. Primers like epoxy or zinc chromate are used as undercoats to provide corrosion protection, but they are not the exterior finish specified by this MIL-C standard. Acrylic enamel has historical use but doesn’t meet the long-term UV durability and performance of aliphatic polyurethane specified here.

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