Aircraft Finishes
What is used as a protective finish for the inside of steel tubing?
Hot linseed oil.
(8033)-Which of the following is a hazard associated with sanding on fabric covered surfaces during the finishing process?
Static electricity buildup.
When mixing epoxy paint, should the converter be added to the resin or the resin to the converter?
The converter should always be added to the resin, never the resin to the converter.
What happens to an enamel finish when paint remover is applied to it?
The enamel softens and swells so that it pulls away from the surface of the metal.
What is the general reason for runs and sags in a finish that is being sprayed onto a flat surface?
Too much paint is being applied. The film is too thick.
(8029)-Which type of coating typically includes phosphoric acid as one of its components at the time of application?
Wash primer.
(8032)-A correct use for acetone is to
remove grease from fabric.
(8026)-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.
52 inches
(8037)-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?
A glossy, blush-free finish.
(8039)-Which defect in aircraft finishes may be caused by adverse humidity, drafts, or sudden changes in temperature?
Blushing.
(8034)-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?
Corrosion.
How thick should a coat of wash primer be that is used on aluminum alloy aircraft structure?
It should be thin enough that it does not hide the surface of the metal.
What are the two basic types of dope that are used on fabric-covered aircraft?
Nitrate dope and butyrate (CAB) dope.
What kind of dope is used on polyester synthetic fabric that has been heat-shrunk on an aircraft structure?
Nontautening butyrate dope.
(8040)-Which statement is true regarding paint system compatibility?
Old wash primer coats may be overcoated directly with epoxy finishes.
(8030)-Which properly applied finish topcoat is the most durable and chemical resistant?
Polyurethane.
(8028)-What is used to slow the drying time of some finishes and to prevent blush?
Retarder
Why is retarder used in dope when the dope is being sprayed in humid conditions?
The retarder slows the drying of the dope and keeps it from blushing.
What will happen if dope is sprayed over an enameled surface?
The thinner in the dope will penetrate the enamel surface and cause it to swell.
Why should wooden wing spars be finished with a transparent varnish?
The transparent finish allows any decay or rot that develops in the wood to be detected.
What type of thinner is used with zinc chromate primer?
Toluol or toluene.
(8038)-What is the usual cause of runs and sags in aircraft finishes?
Too much material applied in one coat.
When an aircraft is being re-covered, when is fungicidal dope applied to the fabric?
With the first coat of dope that is brushed into the fabric.
What are three types of primer that may be used when painting an aircraft?
Zinc chromate primer, wash primer, and epoxy primer.
(8036)-Before applying a protective coating to any unpainted clean aluminum, you should
avoid touching the surface with bare hands.
(8027)-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
cure to the finish and be very difficult to remove.
(8035)-Fungicidal dopes are used in aircraft finishing as the
first coat to prevent fabric rotting and are applied thin enough to saturate the fabric.
(8031)-Aluminum-pigment in dope is used primarily to
reflect ultraviolet from the fabric.
