FAA A&P Airframes Test 2025 – 400 Free Practice Questions to Pass the Exam

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What surface condition can lead to dope blushing during its application?

Applying over a dry and clean surface

Application over a damp surface

Blushing in dope finishing occurs when moisture condenses on the surface during or shortly after the application of the dope. This typically happens when dope is applied over a damp surface. The moisture interferes with the drying process, leading to a milky or cloudy appearance known as blushing. This condition can affect the aesthetic quality of the finish and potentially the performance of the dope layer.

When dope is applied to a damp surface, the trapped moisture beneath the dope can create this undesirable effect. In contrast, applying dope to a dry and clean surface is essential for achieving a smooth, flawless finish. Using a well-maintained spray gun ensures that the dope is applied uniformly, and applying in a well-ventilated area promotes proper drying and helps to prevent blushing, but these factors alone do not cause blushing like applying over a damp surface does.

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Using a well-maintained spray gun

Applying in a well-ventilated area

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