(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 90°F (10.0 to 32.2°C) from date of manufacture.
2) Storage life of Products Research Co. PR-1560M, PR-1560MC, PR-1560MK is 6 months at 50 to 90°F (10.0 to 32.2°C) from date of manufacture.
Aug 01/94 28-11-0 Page 812A/812B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(8) Mixing 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)
Conditions unmixed materials to 60 to 90°F (15.6 to 32.2°C) prior to mixing.
(b)
Measure out proportionate volumes of base and catalyst, plus reducer or thinner if spray application is desired, as specified (Fig. 805).
(c)
Agitate base component for 10 minutes in Red Devil multi-directional shaker.
(d)
Mix base and catalyst, plus reducer as needed. Allow 1 hour induction time prior to application. Maximum pot life is 8 hours at 75 +5°F (23.9 +2.8°C).
(e)
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 VISCOCITY ZAHN NO.1 77+ 2°F MFGR. DESIGNATION PARTS BY VOLUME
Bostik-Finch (BMS Base 454-4-1 3 454-4-1 3
10-20 Type II) Catalyst CA-109 1 31 - 40 sec. CA-109 1
Reducer TL-52 approx. 1
DeSoto Base 823-011 4 823-011 4
(MIL-C-27725) Activator 910-099 1 31 - 40 sec. 910-099 1
Reducer 020-037 approx.4 020-037 0 - 4
Base 823-730 1 823-730 4
Activator 910-702 1 31 - 40 sec. 910-702 1
Reducer 020-707 approx.4 020-707 0 - 4
Products Research --- Part A 1 Part A 1
(MIL-C-27725) --- Part B 2 31 - 40 sec. Part B 2
502 Corrosion Resistant Finish Mixing Proportions
Nov 15/77 Figure 805 28-11-0
Page 813
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
NOTE: Keep containers of mixed corrosion resistant finish compound tightly closed, while waiting for application, or contents will gradually thicken and gel.
(9) Curing corrosion resistant finish compound
(a) Cure all finish coatings per Fig. 806.
CORROSION CURE TIME PRIOR CURE TIME PRIOR CURE TIME PRIOR CURE TIME PRIOR
RESISTANT FINISH TO FUEL TO TRAFFIC TO ASSEMBLY TO SEALING
(BY MFGR.) EXPOSURE *[1] *[1] *[2]
Bostik-Finch 12 hours at 12 hours at 12 hours at Fig 807
(BMS 10-20 65°F or above 65°F or above 65°F or above *[3]
Type II) or Fig. 807 or Fig. 807 or Fig. 807
*[3] Fig. 808 *[3] *[3] 24 hours at *[3] Fig. 809 or Not
DeSoto
(MIL-C-27725 65°F or above 240 hours at Applicable
65°F or above
Fig. 810 24 hours at *[3] 240 hours at Not
Products
Research 65°F or above 75°F and mini- Applicable
(MIL-C-27725) mum of 30 per-
cent relative
humidity
*[1] Verify cure completion by performing fuel resistance check (Ref par. 4.D. (9)(c)).
*[2] Verify cure completion by performing MEK resistance check (Ref par. 4.D. (9)(c)).
*[3] Allow at least 30 minutes drying at application temperature prior to curing at higher temperatures.
Corrosion Resistant Finish Compound Cure Time 502
28-11-0 Figure 806 Nov 15/77
Page 814
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(b)
Cure time can be shortened by using elevated temperatures and, with some finish compounds, by increasing relative humidity (R.H.) (Fig. 807 thru 810).
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