NOTE: Pot Life
Below 80F 16 hours
80-85F 12 hours
Above 85F 8 hours

(8)  Scrap mixed material whose pot life has expired.
F.  Choice of Primers
(1)  
BMS 10-11, type 1, green primer

(2)  
BMS 10-11, type 1, yellow primer

4.  Paint Airplane
A.  Spray or brush apply primer to a film thickness of 0.003 to 0.008 inch each coat. See figure 702 for spray equipment.
B.  Spray apply enamel using the suitable combination of spray equipment, or brush apply enamel using a natural bristle brush, to a film thickness of 0.001 to 0.002 inch. See figure 702 for spray equipment.
NOTE: Brush application should be made without addition of solvent to catalyzed enamel.
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Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  51-21-51 Page 705 

5.  Restore Airplane to Normal
A.  The drying times listed in parts I and II of figure 703 do not constitute full cure of the coatings. Full cure will vary depending on film thickness, temperature, humidity and in the case of enamel, color. Optimum cure based on 75 (+ 5)°F before exposing to weather or putting into services is 7 days regardless of whether the coatings have been forced dried at higher temperatures or not. When necessary, the minimum drying time prior to service use is 48 hours when cured under 75°F and 24 additional hours at 75-160°F.
B.  Parts I and II of figure 703 are based on one coat film thickness and should be increased proportionately for thicker films.
(1)  
Flash-off time before higher cure temperatures - 15 minutes at room temperature.

(2)  
Before applying sealants, dry primer tack-free. To determine tack-free, a slight downward pressure on the film with the finger shal1 not leave a mark.

C.  The drying times listed in part III of figure 703 are given to facilitate infrared curing and do not constitute full cure of the coating. A flash-off of 1-minute minimum at room temperature is required when infrared is used to accelerate drying.
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F85286 F85299 F85305 F85309 F85310
500  Mixing Proportions 
Feb 15/73  Figure 701 (Sheet 1)  51-21-51 
Page 707 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 Mixing Proportions  500 
51-21-51  Figure 701 (Sheet 2)  Feb 15/73 
Page 708 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Mixing Proportions 
Feb 15/73  Figure 701 (Sheet 3)  51-21-51 
Page 709 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

 Spray Paint Equipment  500 
51-21-51  Figure 702  Feb 15/73 
Page 710 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Curing Times 
Feb 15/73  Figure 703  51-21-51 
Page 711 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

CLEAR HYDRAULIC FLUID RESISTANT OVERCOAT - CLEANING/PAINTING
1.  Equipment and Materials
WARNING:  THESE FINISHES, CLEANERS, AND SOLVENTS CONTAIN TOXIC AND FLAMMABLE COMPONENTS. AVOID BREATHING VAPORS AND MIST. USE WITH ADEQUATE VENTILATION. PROVIDE APPROVED RESPIRATORY PROTECTION AS REQUIRED. DO NOT GET IN EYES. AVOID CONTACT WITH SKIN AND CLOTHING. USE PROTECTIVE EQUIPMENT AS REQUIRED. KEEP FLAMMABLE MATERIALS AWAY FROM SOURCES OF IGNITION.
A.  BMS 3-2, solvent, or aliphatic naphtha TT-N-95
B.  Manual alkaline cleaner. Refer to Chapter 12, Cleaning and Washing.
C.  Cheesecloth, or equivalent
D.  Grade A Coating
(1) 
 Finch 683-3-2

(2) 
 X-310A Catalyst

2.  Surface Preparation
A.  Hand sand high gloss plastic surfaces and painted surfaces with 280 grit or finer abrasive paper to remove gloss. Then clean per step B. Do not sand painted surfaces around decals when clear hydraulic fluid resistant coating is used as an edge sealer.
B.  Clean Surface
(1)  
Scrub surface with clean cheesecloth moistened with solvent or manual alkaline cleaner.

(2)  
Before solvent evaporates, wipe surface with clean, dry cheesecloth.

(3)  
Repeat steps (1) and (2) until no visible signs of soil are evident on a clean cloth.

500 
　
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