(2)  
Secondary fuel barrier sealant is a polyurethane (Type II) material applied to the upper exterior surface of the center fuel tank.

 B.
Equipment

 (1)  
Brush - Paint

 (2)  
Instrument - Dualscope Thickness Measurement, Model MP20 9U437 Fischer Technology Inc. 750 Marshall Phelps Road, Windsor CT 06095-2199

 (3)  
Probe - Thickness Measurement, Pencil - Type, Model ETA3.3H 9U437 Fischer Technology Inc. 750 Marshall Phelps Road, Windsor CT 06095-2199

 C.
Consumable Materials

 (1)  
G00034 Cheesecloth, gauze or laundered rags
 with less than 0.75% oil

 (2)  
A00184 Cleaning Solvent - BMS 11-7

 (3)  
C00259 Primer - BMS 10-11, Type I (yellow)

 (4)  
A00015 Sealant - BMS 5-81, Type II

 (5)  
B00137 - Abrasive paper, 180 grit or finer

 (6)  
G00215 Flat, bristle brush

 D.
Reference

 (1)  
AMM 51-21-02/701, Prepaint Cleaning and Treatment

 E.
Access

 (1)  
Location Zones
 133 Wing Center Section (Left)
 134 Wing Center Seciton (Right)

 F.
Repair of the Secondary Fuel Barrier Sealant

 S 128-024
 (1)  Lightly sand the damaged area with 180 grit, or finer, abrasive paper.
 NOTE: Be careful not to make the bare metal rough if possible.
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757 MAINTENANCE MANUAL
 (2)  S 118-064Remove all contamination with a clean cloth soaked with BMS 11-7 cleaning solvent.
 (3)  S 168-025Rub the area dry with a clean, dry cloth.
 (4)  S 378-069Refinish all bare metal (AMM 51-21-02/701).
 (5)  S 378-065Apply the BMS 10-11 primer, until it makes an overlap with the adjacent area that is not damaged.
 (6)  S 398-026Let the primer dry for 30 minutes to 4 hours before applying BMS 5-81.
 (7)  S 368-066Prepare the secondary fuel barrier sealant (BMS 5-81, Type II) as follows: (a) Make sure the base and accelerator are each homegeneous, free from lumps or gelled particles.
 CAUTION:_______ BE CAREFUL WHEN YOU MIX AND MAKE THE SEALANT SMOOTH TO KEEP AIR BUBBLES TO A MINIMUM. AIR BUBBLES CAN MAKE THE SEALANT DIFFICULT TO APPLY.
 (b) (c)  Before you mix the sealant, stir each component in its container to make sure it is homogeneous.Carefully mix the total contents of the base and accelerator containers or mix at a measured ratio of 100 parts of base to 90 parts of accelerator by weight or by volume.
　
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