Aircraft Finishes Flashcards
What type of thinner is used with zinc chromate primer?
Toluol or toluene.
Common type of aircraft finishes include;
Primers, enamels, lacquers, and epoxies.
What are the two basic types of dope used on fabric-covered aircraft?
Nitrate dope and butyrate (cellulose acetate butyrate, or CAB) dope.
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.
What if too much “drier” is used in the finishing process?
A thin and brittle film causing cracking and peeling.
What is the purpose of zinc chromate?
Primer acting as a base for the paint, highly corrosion resistant.
What is an advantage of butyrate dope?
Less flammable.
What safety precautions should be followed during the dope and fabric process when using solvents?
Wear a respirator.
What are some methods of application for common aircraft dopes?
Dipping, brushing, or spraying.
What system is compatible with epoxy top coats?
Any, in good condition.
Cause for dust (cover spray)?***
Pressure and distance.
***
What is the general reason for runs and sags in a finish that is being sprayed onto a flat surface?
Too much finishing material being applied, the film is too thick. Possibly bad preparation.
What causes orange peel, or spray mottle, in a finish?
Incorrect paint viscosity or improper setting of the spray gun.
What is meant by dope blushing?
Condition in dope finished in which moisture from the atmosphere condenses on the surface and causes some of the cellulose to precipitate from the finish. Leaves a porous, dull, and weak finish.
What causes blushing in a dope finish?
Too high of humidity, temperature being too low, or by drafts or sudden changes in the temperature.
