(1)
Prior to application of Tereco 155 all aluminum surfaces shall have a conversion coating (chromic acid anodizing or alodizing) and a prime coat of BMS 10-11, Type 1, epoxy primer.
(2)
Allow above primers to dry a minimum of 1 hour at room temperature or 15 minutes at 150 ° + 15°F prior to over-coating with the abrasion resistant finish.
B. Previously Painted Surfaces
(1) BMS 10-11 epoxy films shall be cleaned and activated as follows prior to topcoating:
(a)
Epoxy films not over 48 hours old: Wipe with a clean cheesecloth moistened with toluene. Wipe dry before solvent evaporates.
(b)
Epoxy films over 48 hours old: Wipe using toluene or MIBK followed by light sanding with 320 grit or finer abrasive paper. Remove all sanding residue by wiping with methyl isobutyl ketone wetted cheesecloth.
C. Steel Surfaces
(1) Prepare surface and apply one coat of BMS 10-11, Type 1 primer.
4. Mixing and Application of Abrasion Resistant Finish
NOTE: The abrasion resistant coating is supplied in two-component kits consisting of Tereco 155, base material (part A) and Tereco 155, accelerator (part B).
WARNING: AVOID CONTACT WITH SKIN BECAUSE TERECO 155 CONTAINS TOXIC
INGREDIENTS.
A. Stir each component thoroughly prior to mixing.
500
51-21-121 Page 702 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/73
B. Mix the coating as follows:
Brush Application Spray Application
Part B/Part A
(parts by weight) 25/100 25/100 Thin with 9 parts by weight of Thin with 20-30 parts by weight Toluene or Xylene per 125 of toluene or Xylene per 125 parts of coating mixture. parts of coating mixture
C. Thinner should be added to part B prior to mixing parts A and B. Allow the mixed material to stand at least 5 minutes before using.
D. Pot life of Tereco 155 is shown in figure 701. Material whose pot life has expired shall be scrapped. Do not mix more materials than will be used during time-temperature conditions noted in figure 701.
E. Mask off the areas adjacent to the area being coated.
F. Apply one or more coats of Tereco 155 to a continuous film with a dry film thickness of 0.003 inch minimum, regardless of application method. Allow excess solvent to flash off between coats. Dry film thickness not to exceed 0.020 inch.
G. Prior to handling, allow the coating to dry tack free (at least 8 hours at 70° + 5°F). Prior to outdoor exposure, allow the coating to cure at least 12 hours.
F85332
500 Pot Life of Tereco 155
Feb 15/73 Figure 701 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-121 Page 703
H. Prior to assembly, allow coating to cure under the time-temperature conditions shown on curve A in figure 702.
I. Prior to functional movement of parts allow coating to cure under the time-temperature conditions shown on B curve in figure 702.
J. Feather all sharp paint edges with a hardwood stick or other suitable tool. Exercise caution to prevent damage to aluminum skins when using sharp feathering tools.
NOTE: The shelf life if Tereco 155 is six (6) months from date of manufacture.
5. Rework and Repair
A. Clean the areas to be reworked per paragraph 3 and apply Tereco 155. Feather edge all spot painting.
B. Sand surfaces where the abrasive resistant coating has worn out with 280 or finer grit abrasive paper. Clean the area using cheesecloth wetted with toluene and apply Tereco 155 coating. If BMS 10-11, Type l, primer becomes scratched in the sanding operation rework per 3.A.(1) (omitting conversion treatment) and 3.A.(2); if aluminum becomes scratched rework per paragraphs 3 and 4.
F85333
Cure of Tereco 155 500
51-21-121Page 704 Figure 702 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/73
SKIN AND FASTENER CORROSION CONTROL
1. General
A. The following skin and fastener corrosion control procedures are applicable to the wing upper inspar surface as shown in Fig. 701, wing-to-body splice areas (upper and lower) including fasteners and splice plates and the wing center section lower skin which forms a wall of the ram air plenum chamber. The corrosion preventive paint application procedures are applicable in general to the airplane exterior (Ref 51-21-31, Corrosion Removal and Control, for general corrosion removal procedures).
WARNING: FINISHES, CLEANERS, THINNERS, AND SOLVENTS USED IN THIS SUBJECT 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.
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