Aircraft Finishes

Question 1

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

Answer 1

Polyurethane.

Question 2

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 2

Corrosion.

Question 3

Fungicidal dopes are used in aircraft finishing as the…

Answer 3

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

Question 4

Aluminum-pigment in dope is used primarily to

Answer 4

reflect ultraviolet from the fabric.

Question 5

Which statement is true regarding paint system compatibility?

Answer 5

Old wash primer coats may be overcoated directly with epoxy finishes.

Question 6

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

Answer 6

Blushing.

Question 7

If registration numbers are to 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 7

52 inches

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

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 9

Cure to the finish and be very difficult to remove.

Question 10

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 10

A glossy, blush-free finish.

Question 11

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

Answer 11

Retarder.

Question 12

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

Answer 12

Avoiding touching the surface with bare hands.

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

Answer 14

Wash primer.

Question 15

A correct use for acetone is to…?

Answer 15

remove grease from fabric.