Definition
The process of applying liquid coatings called dope to fabric-covered aircraft surfaces to tighten the fabric, seal it against moisture and air, and protect it from ultraviolet light and weather. Multiple coats are brushed or sprayed on, each shrinking and stiffening the fabric as it dries.
Plain English
Painting a special liquid onto aircraft fabric so the fabric pulls drum-tight, becomes airtight, and is protected from sun and weather.
Context Anchor
Seen in aircraft maintenance work on fabric-covered airplanes, especially during fabric repair, recovering, and inspection of fabric surfaces.
Derivation
From the Dutch word doop, meaning a sauce or dipping liquid. The English word came to mean any thick liquid applied as a coating, which is how it carries over to aircraft fabric work.
Why Pilots Care
Correct doping keeps fabric strong, smooth, and airworthy; poor doping can cause fabric to loosen, tear, or allow water damage that leads to structural failure.
Intuition Check
Doping does not mean drugs or performance enhancement here. In aircraft maintenance, it means applying a protective coating to aircraft fabric.
Example Sentence 1
After recovering the wing with new fabric, the technician began doping it with several coats to shrink the material drum-tight.
Example Sentence 2
After sanding between coats, the doped surface was ready for the final color paint.