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A 737-300/400/500MAINTENANCE MANUAL

70 60 50 40 30 20 10
VISCOSITY RANGE IN SECONDS (#4 FORD CUP)

80 70 60 50 40 30 20 10
VISCOSITY RANGE IN SECONDS (#2 ZAHN CUP)
Corogard Viscosity
Figure 702

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 (b)  Let the zinc chromate primer dry at 65-85°F for not less than 45 minutes and not more than 72 hours. 1) If after 72 hours and you do not apply the Corogard or
 Aeroflex, do these steps:
 a) Remove the primer.
 b) Apply a new layer of the wash primer and the zinc

 chromate primer to the surface.
 (c)  
Rub the dry zinc chromate primer lightly with a 400 grit (minimum) abrasive paper to get a smooth surface.

 (d)  
Clean the surface with a clean cloth that is moist with BMS 3-2 solvent and naphtha.

 H.  Apply the BMS 10-11, Type 1 primer (Apply to surfaces with epoxy primer and did not remove with paint stripper).
 S 377-015-B00
 (1)  
Apply BMS 10-11, type 1 primer (AMM 51-21-99/701).

 S 377-016-B00

 (2)  
Let the BMS 10-11, Type I primer dry before you apply Corogard or Aeroflex (AMM 51-21-99/701).

 I.  Apply the Corogard EC-843 or EC-843S (Optional)
 S 377-021-B00
 WARNING: MAKE SURE YOU KEEP THE MIXTURE OF COROGARD AND ALUMINUM POWDER
_______ IN THE CORRECT CONTAINER IF YOU DO NOT USE IT IMMEDIATELY. WHEN YOU MIX THE COROGARD WITH THE ALUMINUM POWDER, IT RELEASES FLAMMABLE HYDROGEN GAS. KEEP THE MIXTURE IN AN OPEN CONTAINER OR A CONTAINER WITH OPENINGS ON THE COVER. FAILURE TO DO THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  Prepare the Corogard EC-843 and EC-843-S.
 NOTE: Corogard EC-843 and EC-843-S have two components, the resin
____ component and the aluminum powder component (12.5 ounces aluminum powder EC-1101 for each gallon of resin EC-843, or
 9.0 ounces aluminum powder EC-1101 for each gallon of resin EC-843-S).
 (a)  
Put the resin component through a 60-80 mesh metal sieve into a pressure pot or a mixer.

 (b)  
Put the aluminum powder component in a different container from the resin component.

 (c)  
Slowly add the methyl isobutyl ketone or the butyl acetate to make the mixture smooth and constant.

 (d)  
Put the aluminum powder through the 60-80 mesh metal sieve into the pressure pot or mixer.

 (e)  
Fully mix the mixture manually or with a power mixer.

 (f)  
Make sure the mixture is smooth and constant.

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 (g)  Use one of these materials to make the mixture thin for airspray:
 NOTE: The thinner must not be more than 20 percent (by volume)
____
 of the base material.

 1) Methyl isobutyl ketone 2) Butyl acetate 3) Five parts methyl isobutyl ketone (by volume) to three
 parts butyl acetate (by volume) 4) One part methyl isobutyl ketone (by volume) to one part butyl acetate (by volume).
 (h)  The pot life of this material is 16 hours with no temperature limit.
 S 377-027-B00
 (2)  Apply the Corogard EC-843 or EC-843S.
 (a)  
Apply one layer of the EC-843 or EC-843S Corogard mixture with a spray gun. 1) Frequently shake the mixture in the pot.

 (b)  
Between the first and subsequent layers, stop for a minimum of 30 minutes before you apply a new layer.

 NOTE: On some surfaces, it is not necessary to let the mixture
____ dry before you can apply a second layer. For example, horizontal surfaces where there is no runs or sags.
　
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