NOTE: The pot life for the mixture is 4 hours for white mixtures and 3 hours for black mixtures.
(e)
Stir the mixture continuously while you add the grit.
(11)
Spray one to two coats of the nonskid finish mixture to cover the base coat.
NOTE: Application with a brush or roller is acceptable for touch up work.
(12)
Let each layer of nonskid finish dry for 30 minutes before you apply the next coat.
(13)
Apply one or more coats to get a dry film thickness of 0.003 to 0.005 inches (6 to 8 ounces per square yard).
NOTE: Do not paint over seals.
(14)
Mask and apply the flat black DeSoto P1000 paint (arrows).
NOTE: It is not necessary to mix the black paint with grit if it is being applied on top of white paint mixed with grit. The black paint (with or without grit) can be sprayed, brushed, or rolled on. Make sure the finished arrows are solid black.
(15)
Let the nonskid finish dry for 24 hours at 70°F.
NOTE: You must remove the masking tape before the finish is fully dry.
3. Refinish the Overwing Emergency Exit Walkway with Watson Traffictred
A. Equipment
(1)
Spray equipment (use either one)
(a)
DeVilbiss MBCX or P-MBC-510 spray gun with #62CS (#62 air cap, AS needle and CS fluid tip) and special heavy fluid spring
(b)
Binks #62 spray gun with #68 nozzle assembly (#68 air cap, 368 needle and 69 fluid tip)
(2)
Material Pressure Tank - 100 psi pressure with a mechanism to stir fluid for agitation during application
(3)
Fluid hose - of sufficient diameter to give correct pressure
504
Feb 20/93 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-151 Page 707
B. Consumable Materials
(1)
White walkway finish - Watson Standard Company A862 Traffictred
(2)
Black walkway finish - Watson Standard Company A 419A Traffictred
(3)
Thinner
(a) Aliphatic Naphtha TT-N-95, Type II
(4)
Solvents
(a)
Methyl Isobutyl Ketone (MIBK), TT-M-268
(b)
Acetone, Technical, O-A-51
(5)
Paint Strippers (any listed below or equivalent)
(a)
CEE BEE A-228D, McGean Chemical Company
(b)
Turco 5351, Turco Products
(c)
Pennwalt E-Z Strip 19E, Pennwalt Corp.
(6)
Primers
(a)
BMS 10-79 Type III (preferred primer)
NOTE: Type III is preferred because it is not strippable and has better corrosion resistance than Type II.
(b)
BMS 10-79 Type II (alternate primer)
(7)
Enamel base coat
(a) BMS 10-60, Type II, semi-gloss white color, BAC 7022
(8)
Alodine 600
(9)
Abrasive Paper - Aluminum Oxide, 320-grit (minimum)
(10)
Abrasive Pad - Scotchbrite very fine, color - red/garnet
(11)
Tape - masking
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51-21-151 Page 708 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
C. References
(1) 51-21-41/701, Alodizing
D. Procedure
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(1)
Remove the existing nonskid finish with paint stripper.
(2)
Do this step to prepare the surfaces that have a coat of primer less than 48 hours old:
(a) Clean the surface with solvent.
(3)
Do these steps to prepare the surfaces that have a coat of primer more than 48 hours old:
(a)
Clean the surface with solvent.
(b)
Rub the surface lightly with 320-grit (minimum) aluminum oxide abrasive paper.
(c)
Clean the surface again with solvent.
(d)
Apply the BMS 10-79 Type III primer.
(4)
If the primer is removed and the aluminum shows, do the steps that follow:
(a)
Clean the exposed surface with solvent.
(b)
Abrade surface with Scotchbrite abrasive pad to remove surface oxide.
(c)
Clean the exposed surface with solvent.
(d)
Apply the Alodine 600 (Ref 51-21-41/701).
(e)
Apply the BMS 10-79, Type III primer.
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