CAUTION: DO NOT APPLY B-2000 COATING IN AN ATMOSPHERE CONTAINING OTHER SOLVENTS, AS THIS CAUSES FILM CRATERING AND POOR ADHESION.
(1)
Slowly add distilled or deionized water to B-2000 coating per container instructions, while slowly agitating mixture.
CAUTION: AVOID SHAKING TO PREVENT AIR FROM BECOMING ENTRAPPED.
(2)
Brush or spray apply the mixed B-2000 coating to a dry film thickness of 0.8 to 1.2 mils (0.0008 to 0.0012 inch).
NOTE: If used, brushes must be of soft, high quality bristles.
(3)
Allow to air dry a minimum of 1 hour at 70°F to 90°F.
(4)
Bake coating at 350 + 25°F a minimum of 1 hour.
NOTE: Coating must be dry before baking. If blistering occurs during baking, air-drying time should be increased.
When treating air conditioning and thermal anti-icing ducts, if they are treated without removing from airplane, baking will be accomplished in place during operation of the above mentioned systems.
3. Application of BMS 10-82 Coating
A. General
(1)
This procedure contains the application of a low emissivity gold coating to titanium.
(2)
The gold coating is produced by spray applying a solution of gold salt in an organic vehicle and baking at high temperature to burn off the vehicle and reduce the salt to a thin gold film.
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B. Equipment and Materials
WARNING: SUBSTANCES LISTED BELOW MAY BE TOXIC OR FLAMMABLE. USE WITH ADEQUATE PRECAUTIONS.
(1)
Low Emissivity Gold Coating - BMS 10-82 (Storage 40-80°F)
(2)
Solvent - Toluene, TT-T-548 or JAN-T-171
(3)
Scotchbrite Sheet, Finishing Type A (aluminum oxide grit)
C. Prepare for Coating Application
(1)
Protect parts as required and handle with clean gloves to prevent contamination. Remove previous protective coating.
CAUTION: TO PREVENT CORROSION, CARE MUST BE TAKEN TO AVOID ANY SALT DEPOSITS, INCLUDING FINGERPRINTS, ON AN UNPREPARED TITANIUM SURFACE. HANDLE TITANIUM WITH CLEAN WHITE COTTON GLOVES.
(2)
Inspect for visual evidence of soil. Remove soil by cleaning with TT-T-548 solvent. Scotchbrite sheet may be used prior to solvent cleaning to aid in soil and stain removal. Parts must be clean and dry when coating is applied.
D. Apply Coating
(1)
Stir or shake BMS 10-82 until homogeneous.
(2)
Spray apply. Apply sufficient coats to produce a transparent red, uniform film, free of sags, runs and wrinkles. Allow 5 to 10 minutes between coats. Recommended air atomizing pressure is 10 to 25 pounds.
(3)
Bake as soon as possible after application. Keep wet film free of contamination.
(4)
Bake coated parts at a part temperature of 825 (+ 25)°F for 10 to 15 minutes. Use a well-ventilated oven to allow removal of smoke and fumes. The coating after baking must be a tightly adherent yellow gold film, which is smooth, uniform and free from runs, sags, blisters, pinholes, wrinkles or other surface imperfections.
(5)
Protect parts until installation to avoid rework and repair.
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NONSKID SURFACE - CLEANING/PAINTING
1. General
A. The nonskid finish is applied to a specified area of each wing surface to make the overwing emergency exit walkway.
B. The overwing emergency exit walkway is made from one of two nonskid finishes. One of these nonskid finishes is preferred. The preferred nonskid finish is DeSoto series P1000 and pumice grit. The alternate nonskid finish is Watson Traffictred.
C. The preferred and the alternate nonskid finishes cannot both be used on the same wing surface. The nonskid finishes cannot be used together.
D. If you change from one nonskid finish to the other, the old nonskid finish must be removed from the wing surface completely.
E. This procedure contains two tasks:
(1)
The first task is to refinish the overwing emergency exit walkway with DeSoto P1000 and pumice grit (preferred).
(2)
The second task is to refinish the overwing emergency exit walkway with the Watson Traffictred (alternate).
2. Refinish the Overwing Emergency Exit Walkway with DeSoto P1000 and Grit
A. Equipment
(1) Spray equipment
(a)
Binks Mach 1 Plus, with Model 82-760 Mach 1 Agit Cup. Agitated pressure pot can also be used.
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