2-83. PREPARATION AND APPLICATION OF DUPONT IMRON URETHANE ENAMEL.
a. MIXING RATIO: Three parts enamel with one part activator 192S. Thin with approximately one part
reducer Y8485S.
— NOTE —
For each gallon of the above mixture, add and mix in four ounces of accelerator 189S, and
two to four ounces per gallon (as required to prevent craters, surface imperfections, etc.) of
additive 259S.
b. APPLICATION: Two wet coats of the enamel. The first coat shall be allowed to flash dry for ten minutes
minimum prior to application of the second coat. The enamel shall be forced dried at 100° ± 5°F for 90 minutes
minimum after the second coat.
c. DRY FILM THICKNESS: Of the combined coatings shall be 0.0018 to 0.0022 inch.
c. Suggested Solvents:
Safety Solvent per MIL-S-18718
Sherwin Williams Lacquer Thinner R7KC120
Glidden Thinner No. 207
2-84. PRODUCT LISTING FOR RANDOLPH PAINT FINISH.
a. Prime Coat:
Use zinc chromate primer per MIL-P-7962.
b. Color Coat:
Randolph Paints B5420/D7784
Thinner B5408A
Solvent P6737
2-85. PREPARATION AND APPLICATION OF ZINC CHROMATE PRIMER. This primer shall be used only
on aluminum previously primed with MIL-P-8585 zinc chromate or MIL-C-8514 wash primer. The use of this
primer over MIL-P-8585 is an exception and will result in a small reduction in gloss. This condition is
acceptable on aircraft with special corrosion proofing.
a. MIXING RATIO: Mix approximately two parts of the packaged primer with three parts of lacquer thinner.
Vary mix where needed to allow a thin wet coat application.
b. APPLICATION: A thin wet coat.
c. DRY FILM THICKNESS: Between .0003 and .0005 inches thick.
— NOTE —
Blushing may be controlled under conditions of high humidity by the replacing of up to 6%
of the thinner with ethylene glycol monobutyl ether per TT-E-776.
2-86. FINISH PAINTING WITH RANDOLPH PAINT (B5420/D7784).
a. MIXING RATIO: When Randolph B5420 is sprayed it should be thinned for proper spraying results for
either hot or cold spray. Randolph D7784 is prethinned, but may be thinned if required.
b. APPLICATION: May be hot or cold sprayed.
c. DRY FILM THICKNESS: Desirable finish varies from 0.00175 to 0.003 inch dry film thickness.
— NOTE —
Overspray may be redissolved by spraying with Randolph B5408A thinner or P6737 solvent.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY 28, 1989
HANDLING AND SERV I C I N G
1C16