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 removed.
 (a) Remove about two inches of sealant on each side of the internal
 leak point when the leak is in a fillet seal. Sealant that
 does not stick well to the structure can be pulled up easily by
 hand. This sealant must be removed and replaced.
 S 366-149
 (6)  Fully clean the area to be sealed.
 (a) Do not apply any sealant before the area is cleaned and dry.
 Sealant will not stick to a surface that is not clean. Use
 cheesecloth or another lint-free cloth, and methyl ethyl ketone
 (MEK) or another approved solvent listed in the task "Fuel Tank
 Leak Detection and Repair" (above).
 (b) Clean the surface with one cloth wet with solvent and then rub
 the surface with a dry cloth. Change the cloths frequently to
 prevent the spread of contaminants. Continue to clean the
 surface with a wet cloth then a dry cloth until the dry cloth
 does not show any dirt, sealant, or any other substance.
 (c) Use a plastic scraper and solvent as necessary to remove all
 pieces of remaining sealant.
 (d) DO NOT use metallic tools which can damage the dry bay barrier______
 panel or access door, or the BMS 10-20, Type II primer applied
 to the metal structure.
 S 366-150
 (7)  Mix the sealant.
 (a) Use BMS 5-26, Type II, Class A and B sealant. Brand-name
 equivalents to BMS 5-26, Type II sealant are Pro-Seal 890 and
 PR-1440. Class A sealant is thin and is applied with a brush.
 Class B sealant is thick, and is applied with fairing tools
 like those shown in Fig. 607.
 (b) BMS 5-26, Type II sealant is made to stick to the BMS 10-20,
 Type II primer used in the fuel tank.

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A

757
MAINTENANCE MANUAL

 S 366-151
 (8)  
Sealant is sold in cans and cartridges.

 (a)  
Sealant in cartridges is pre-measured and can be more completely mixed. Class B sealant in cans must be mixed on a clean piece of scrap metal. Empty the complete contents of the two cans onto the scrap metal and mix the base and accelerator together until the mixture is uniform in color with no streaks. Class A sealant in cans must be mixed in a paper cup. Empty the complete contents of the two cans into the cup.

 (b)  
Do not permit air to mix with the sealant. Sealant in cartridges helps to prevent air from mixing with the sealant. Commercially availble electric mixers do most of the work to mix sealant supplied in cartridges.
　
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