Aircraft Finishes

Question 1

If registration numbers are tso be applied to an aircraft with a letter height of 12 inches, what is the
minimum space required for the registration mark N1683C?
Note:
2/3 x height = character width.
1/6 x height = width for 1.
1/4 x 2/3 height = spacing.
1/6 x height = stroke or line width.

Answer 1

52 inches

Question 2

If masking tape is applied to an aircraft such as for trim spraying, and is left on for several days and/or
exposed to heat, it is likely that the tape will

Answer 2

Cure to the finish and be very difficult to remove

Question 3

What is used to slow the drying time of some finishes and to prevent blush?

Answer 3

Retarder

Question 4

Which type of coating typically includes phosphoric acid as one of its components at the time of
application?

Answer 4

Wash primer

Question 5

Which properly applied finish topcoat is the most durable and chemical resistant?

Answer 5

Polyurethane

Question 6

Aluminum-pigment in dope is used primarily to

Answer 6

Exclude sunlight from the fabric

Question 7

A correct use for acetone is to

Answer 7

Remove grease from the fabric

Question 8

Which of the following is a hazard associated with sanding on fabric covered surfaces during the
finishing process?

Answer 8

Static electricity buildup

Question 9

What is likely to occur if unhydrated wash primer is applied to unpainted aluminum and then about 30
to 40 minutes later a finish topcoat, when the humidity is low?

Answer 9

Corrosion

Question 10

Fungicidal dopes are used in aircraft finishing as the

Answer 10

First coat to prevent rotting and are applied thin enough to saturate the fabric

Question 11

Before applying a protective coating to any unpainted clean aluminum, you should

Answer 11

Avoid touching the surface with bare hands

Question 12

What is likely to occur if hydrated wash primer is applied to unpainted aluminum and then about 30 to
40 minutes later a finish topcoat, when the humidity is low?

Answer 12

A glossy, blush free finish

Question 13

What is the usual cause of runs and sags in aircraft finishes?

Answer 13

too much material applied in one coat

Question 14

Which defect in aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in
temperature?

Answer 14

Blushing

Question 15

Which statement is true regarding paint system compatibility?

Answer 15

Old wash primer may be over coated directly with epoxy finishes