B. 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

 C. Reference
 (1)  AMM 51-21-21/701, Prepaint Cleaning and Treatment
 D. Access
 (1)  Location Zones
 133 Wing Center Section (Left)
 134 Wing Center Seciton (Right)

 E. Repair of the Secondary Fuel Barrier Sealant
 S 128-338
 (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.
____
 S 118-339
 (2)  Remove all contamination with a clean cloth soaked with BMS 11-7 cleaning solvent.
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 (3)  S 168-340Rub the area dry with a clean, dry cloth.
 (4)  S 378-341Refinish all bare metal (AMM 51-21-21/701).
 (5)  S 378-342Apply the BMS 10-11 primer, until it makes an overlap with the adjacent area that is not damaged.
 (6)  S 398-343Let the primer dry for 30 minutes to 4 hours before applying BMS 5-81.
 (7)  S 368-344Prepare 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.
 NOTE:____ The material is normally supplied in premeasured kits to give the correct ratio.
 (d)  Stir slowly until you get a homogeneous mixture.

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737-300/400/500MAINTENANCE MANUAL
 S 398-345
 WARNING: DO NOT BREATHE THE FUMES FROM THE SECONDARY FUEL BARRIER
_______ SEALANT (BMS 5-81, TYPE II). KEEP THE SEALANT AWAY FROM SPARKS, FLAME OR HEAT. THE SEALANT IS POISONOUS AND FLAMMABLE AND CAN CAUSE INJURY OR DAMAGE.
 CAUTION: DO NOT APPLY THE SECONDARY FUEL BARRIER SEALANT (BMS 5-81,
_______ TYPE II), IF THE AIR TEMPERATURE IS LESS THAN 60°F (15°C) OR THE RELATIVE HUMIDITY IS MORE THAN 95 PERCENT. THE SEALANT WILL NOT CURE CORRECTLY IF THE TEMPERATURE AND RELATIVE HUMIDITY CONDITIONS ARE NOT IN THE LIMITS.
 (8)  
Apply BMS 10-11 Type I primer, before you apply BMS 5-81 Type II to make areas smooth that have sharp edges (recommended).

 S 398-346

 (9)  
Apply two layers of BMS 5-81, Type II sealant with a flat, bristle brush.

 (a)  Make sure the total thickness of the two layers of applied sealant is 0.005 to 0.010 inch (5-10 mils).
 NOTE:____ In some locations, it can be necessary to apply
 sealant with a thickness of more than 0.010 inch.  This
 can be necessary to make sure the sealant has the
 minimum thickness of 0.005 inch or more in all
 locations.  This condition is permitted, but the

 thickness of the sealant is not to be more than 0.020 inch.
 (b)  
For horizontal surfaces, let the sealant dry a minimum of 1/2 hour between layers.

 (c)  
For vertical surfaces, let the sealant dry a minimum of 2 hours between layers.

 S 398-347
 (10) Cure the sealant.
　
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