S 377-033-B00
(7)
Apply BMS 10-11 or BMS 10-79 primer to the surface
(AMM 51-21-99/701).
F. Prepare the Painted Surfaces
S 167-021-B00
(1) For epoxy primer that was applied in less than 48 hours do these steps:
(a) Use abrasive papers or pads, 240 grit (minimum), to remove rough surfaces and loose dirt.
NOTE: If it is necessary to rub the surface to the bare metal,
____ prepare the surface as if it was not painted.
(b) Rub the surface until it is smooth.
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(c) Clean the surface with tack rags to remove dirt and lint before you apply the topcoat.
S 167-031-B00
(2) For epoxy primer that was applied in more than 48 hours do these steps:
CAUTION: USING COURSE GRIT ABRASIVES CAN CAUSE DAMAGE TO THE
_______ SUBSTRATE FIBERS IF THE GRIT COMES INTO CONTACT WITH THE RESIN COATING OF THE COMPOSITE SUBSTRATE. TO REDUCE THE POSSIBILITY OF DAMAGE TO THE COMPOSITE SUBSTRATE, ONCE THE TOPCOAT HAS BEEN REMOVED, USE PROGRESSIVELY FINER GRITS TO OBTAIN THE REQUIRED SURFACE FINISH.
(a) Use abrasive paper or pads to remove surface and loose soil. It is optional to use course grit abrasives for expedient cleaning and material removal to the first paint topcoat layer.
NOTE: Do not use abrasive paper on rough surfaces such as
____ castings and forgings. Use a tack rag or solvent to clean these surfaces.
(b)
Rub the surface with a clean cheesecloth that is moist with solvent.
(c)
Dry the surface with a clean dry cheesecloth.
(d)
Make sure the surface is dry before you apply the finish.
S 167-032-B00
(3) For Prestec that was applied in more than 12 hours, do step (2) to prepare the surface but use aliphatic naphtha thinner number TL-52.
NOTE: For Prestic that was applied in more than 12 hours, you do
____
not have to prepare the surface.
TASK 51-21-21-167-037-B00
4. Plastic Surfaces Prepaint Cleaning and Pretreatment
___________________________________________________
A. Equipment
(1)
Spray equipment; Commercially available
(2)
Sand blast equipment; Commercially available
(3)
Safety goggles; Commercially available
B. Consumable Materials
(1)
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
(2)
B00153 Solvent - Toluene (Toluol), TT-T-548
(3)
B00154 Solvent - Toluene, JAN-T-171
(4)
B00189 Solvent - Thinner, TL-52
(5)
B00083 Solvent - Aliphatic Naphtha, TT-N-95
(6)
C00058 Conditioner - Static, Magna 28-C-1
(7)
C00059 Surfacer - Dexter 8-W-5 Magna
(8)
C00081 Hardener - Magna 10-C-32
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(9)
C00062 Reducer - Magna 66-C-28
(10)
G00382 Paper - Abrasive, 240 Grit (Minimum)
(11)
G00381 Paper - Abrasive, 150 Grit (Minimum)
(12)
G00034 Cheesecloth - Clean and Lint Free
(13)
G00371 Brush - Bristle, Stiff
C. References
(1)
AMM 51-21-11/701 - Paint Stripping
(2)
AMM 51-21-41/701 - Alodine Coating
(3)
AMM 51-21-99/701 - Decorative Exterior Paint System
(4)
AMM 51-31-00/201, Seals and Sealing
(5)
SOPM 20-10-06, Repair of Conductive Coatings
D. Clean the Plastic Surfaces that do not have Paint but have Surface Porosity
S 117-008-B00
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