A correct use for acetone is to thin zinc chromate primer. remove grease from fabric. thin dope.
Aluminum-pigment in dope is used primarily to provide a silver color. aid in sealing out moisture from
the fabric. reflect ultralight from the fabric.
Before applying a protective coating to any unpainted clean
aluminum, you should wipe the surface with avgas or
kerosene. remove any conversion coating
film. avoid touching the surface with bare
hands.
Fungicidal dopes are used in aircraft finishing as the first, full-bodied, brushed-on coat to
prevent fungus damage first coat to prevent fabric rotting
and are applied thin enough to
saturate the fabric. final, full-bodied, brushed-on coat to
reduce blushing.
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 not seal out the finishing material if the
delay or heating occurs before
spraying. be weakened in its ability to
adhere to the surface. cure to the finish and be very
difficult to remove.
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? Corrosion. A glossy, blush-free finish. A dull finish due to the topcoat
'sinking in' to primer that is still too
soft.
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. A glossy, blush-free finish. A dull finish due to the topcoat
'sinking in' to primer that is still too
soft.
What is the usual cause of runs and sags in aircraft finishes? Too much material applied in one
coat. Material is being applied too fast Low atmospheric humidity.
What is used to slow the drying time of some finishes and to
prevent blush? Reducer. Retarder. Rejuvenator.
Which defect in aircraft finishes may be caused by adverse
humidity, drafts, or sudden changes in temperature? Orange peel. Blushing. Pinholes.
Which of the following is a hazard associated with sanding
on fabric covered surfaces during the finishing process? Overheating of the fabric/finish,
especially with the use of power tools. Static electricity buildup. Embedding of particles in the finish.
Which properly applied finish topcoat is the most durable
and chemical resistant? Synthetic enamel. Acrylic lacquer. Polyurethane.
Which statement is true regarding paint system
compatibility? Old-type zinc chromate primer may
not be used directly for touchup of
bare metal surfaces. Acrylic nitrocellulose lacquers
may be used over old
nitrocellulose finishes. Old wash primer coats may be
overcoated directly with epoxy
finishes.
Which type of coating typically includes phosphoric acid as
one of its components at the time of application? Wash primer. Epoxy primer. Zinc chromate primer.
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