(8)
Vacuum clean tank to remove flakes of old finish, pieces of old sealant, lint and
miscellaneous foreign matter.
(9)
If alodine metal surface treatment has been worn off or damaged, the metal surface must be realodized before new finish material is applied.
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CAUTION: USE ONLY ALODINE 600 TO REPAIR ALUMINUM WING SURFACES. PRIMER ADHESION PROBLEMS CAN OCCUR IF OTHER ALODINE SOLUTIONS ARE USED.
(a) Apply an alodine layer to the surface with Alodine 600 (SRM\51-10-2).
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(10)
If sealing is required due to finish removal, par. 3.C.(5), reapply sealant as necessary (Ref 28-11-0 AR).
(11)
Ensure that all finish application equipment and fuel tank surfaces to be coated are perfectly clean. If in doubt, clean equipment in MEK solvent and clean tank surfaces with BMS 11-7 solvent immediately prior to finish application.
(12)
Check to ensure that storage life of unmixed corrosion resistant compounds has not expired and that sufficient finish material is available to complete the application.
(a)
Storage life of BMS 10-20, Type II is 12 months at 40 to 900F (4.4 to 32.20C) from date of manufacture.
(b)
Storage life of MIL-C-27725 corrosion preventive coatings. 1) Storage life of DeSoto 823-011 or 823-730 is 12 months at 50 to 900F (10.0 to 32.20C) from date of manufacture. 2) Storage life of Products Research Co. PR-1560M, PR-1560MC, PR-1560MK is 6 months at 50 to 900F (10.0 to 32.20C) from date of manufacture.
(l3) Mask, as necessary, any non-structural fuel tank equipment areas which are in, or adjacent to, the area which is to receive the finish application.
CAUTION: REMOVE ALL MASKING TAPE AFTER FINISH APPLICATION IS COMPLETED OR FUEL FEED BOOST PUMP SUCTION INLETS MAY BECOME CLOGGED.
NOTE: Corrosion resistant finish must not be used on electrical bonding surfaces, clamps, O-ring surfaces, valves, measuring sticks, tank and compensator units, wiring, boost pumps, filler caps, or other nonstructural equipment.
(14) Ensure that finish application temperature will be maintained at 50-1000F (10.0-37.80C) with less than 85 percent relative humidity throughout the application process (brush or spray).
D. Apply Corrosion Resistant Finish
WARNING: THE AREA IN WHICH CORROSION RESISTANT FINISH IS APPLIED SHOULD BE WELL VENTILATED. DO NOT GET IN EYES OR ON SKIN. WASH HANDS BEFORE EATING. KEEP AWAY FROM IGNITION SOURCES.
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(1) Using respirators, mix corrosion resistant finish compounds.
WARNING: SOME OF THE MATERIALS USED IN MIXING BMS 10-20 TYPE II OR MIL-C-27725 FINISH COMPOUNDS ARE TOXIC, FLAMMABLE, AND OTHERWISE HAZARDOUS. ALL MIXING MUST BE DONE IN VENTILATED AREAS BY QUALIFIED PERSONNEL WEARING RESPIRATORS. PERSONS NOT WEARING RESPIRATORS MUST LEAVE THE AREA.
(a)
Condition unmixed materials to 60 to 90°F (15.6 to 32.2°C) prior to mixing.
(b)
Agitate base component for 10 minutes in shaker.
(c)
Measure out proportionate volumes of base and catalyst, plus reducer or thinner if spray application is desired, as specified (Fig. 701).
1) For zinc rich epoxy primer, use 7 parts base (Bostik 463-6-28) to 1 part catalyst (Bostik X-344). Thinner may be used (Bostik Thinner TL-52) up to 1 part max.
(d)
Thoroughly mix the zinc rich base inertial to assure that the zinc particles are in suspension.
(e)
Mix base and catalyst, plus reducer as needed. Allow 1 hour induction time (30 minutes for zinc rich primer) prior to application. Maximum pot life is 8 hours at 75 +5°F (23.9 +2.8°C) for BMS 10-20 and MIL-C-27725, and 6 hours for zinc rich primer.
(f)
Immediately after mixing, mark container with date and hour of mixing and date and hour pot life expires.
MANUFACTURER COMPONENT METHOD OF APPLICATION
SPRAY BRUSH
MFGR. DESIGNATION PARTS BY VOLUME VISCOSITY ZAHN NO. 1 77 +2°F MFGR. DESIGNATION PARTS BY VOLUME
Bostik West (BMS Base Catalyst 454-4-1 3 31-40 454-4-1 3
10-20 Type II) Reducer CA-109 TL-52 1 approx. 1 seconds CA-109 1
DeSoto Base Activator 823-011 4 31-40 823-011 4
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