51-21-95
ALL ú ú B01 Page 709 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 397-013-B00
(2) On surfaces with BMS 10-11 and BMS 10-20 primer (cannot remove with paint stripper), prepare the surface (AMM 51-21-99/701).
F. Apply the Wash Primer MIL-C-8514 (Apply to bare surfaces)
S 377-020-B00
WARNING: DO NOT GET THE FINISHES, CLEANERS, THINNERS AND SOLVENTS IN
_______ YOUR MOUTH OR EYES, OR ON YOUR SKIN OR CLOTHES. DO NOT BREATHE THE FUMES FROM THESE MATERIALS. MAKE SURE THE AIR FLOWS FREELY THROUGH THE WORK AREA. USE THE NECESSARY RESPIRATORY PROTECTION. KEEP THESE MATERIALS AWAY FROM SPARKS, FLAME AND HEAT.
(1) Mix the wash primer.
(a) Shake the base material and the acid accelerator fully before you mix the primer solution.
NOTE: The wash primer has two components, a resin base
____ material (4 parts by volume) and an acid accelerator (1 part by volume).
(b) Slowly add a small quantity of the acid accelerator to the base material.
NOTE: Do not add the base material to the acid accelerator.
____
(c)
Fully mix the mixture manually.
(d)
Continuously mix the mixture when you add the remaining quantity of the acid accelerator.
(e)
Identify the container with a label.
1) Write the date and hour when the mixture was mixed and when the pot life comes to an end.
NOTE: The wash primer mixture has a pot life of 4 hours
____ less than 90°F and 2 hours more than 90°F.
(f)
Do not touch the wash primer mixture for a minimum of 15 minutes before you use it.
(g)
Use equal quantity of ethyl and butyl alcohol to make the wash primer mixture thin.
NOTE: The volume of ethyl/butyl alcohol mixture must not be
____ more than two times the volume of the acid accelerator used.
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51-21-95
ALL ú ú B01 Page 710 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 377-024-B00
(2) Apply the wash primer MIL-C-8514.
(a)
Clean the spray equipment before you use it.
(b)
Make sure to flush the equipment with alcohol before and after you use it.
(c)
Apply one layer of the wash primer with the spray equipment.
(d)
Make sure the continuous thickness of the layer is 0.2-0.4 mils. 1) If the layer is too thick, do these steps:
a) Immediately remove the primer with alcohol. b) Apply the wash primer again to get the correct thickness.
(e)
Let the wash primer dry for not less than 45 minutes and not more than 4 hours at 65-85°F. 1) If you let the primer dry for more than 4 hours, do these
steps:
a) Remove the primer with butyl alcohol or paint stripper.
b) Apply a new layer of primer.
CAUTION: BE CAREFUL WHEN YOU USE BUTYL ALCOHOL TO CLEAN THE PRIMER.
_______ BUTYL ALCOHOL WILL REMOVE THE PRIMER IF YOU DO NOT USE IT CORRECTLY.
(f)
Use varnish or linseed oil rags, or a lightly wet rags with butyl alcohol to clean the primer.
(g)
Carefully remove dust, dirt or unwanted paint from the primer.
(h)
Rub a 400-grit abrasive paper (minimum) on the wash primer to get a smooth surface.
NOTE: Be careful not to remove the wash primer.
____
G. Apply Zinc chromate primer MIL-P-8585 (Apply to surfaces with wash primer)
S 377-025-B00
(1) Mix the zinc chromate primer.
(a)
Fully mix the zinc chromate primer.
(b)
Add thinner to the primer to make the mixture smooth and constant. 1) Slowly add 2 to 2.5 parts (by volume) of toluene to 1 part
(by volume) of primer. 2) Mix the mixture while you add the thinner to the primer.
S 377-014-B00
(2) Apply the zinc chromate primer.
(a) Apply the zinc chromate primer with a spray gun until the thickness of the layer is 0.2-0.4 mils.
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