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 NOTE: A larger nozzle than the nozzle you used for the
____ first fillet seal is necessary.
 1) If you use an extruded nozzle, do these steps: a) Cut the nozzle to make a fit of the dimensions shown in Fig. 807.
 b)  Push the nozzle head against the surfaces to make the fillet seal that you apply the thickest in the middle of the surfaces.
 NOTE: Keep the nozzle of the sealant gun adjacent
____ to the surface to prevent air bubbles.
 2)  If you do not use an extruded nozzle, use a sealant fairing tool to make a full bodied fillet seal. a) Remove all air bubbles and re-entrant fillet seal
 edges.Do this task: "Let the Sealant Dry (Cure) Correctly".If it is necessary, do this Task: Application of Corrosion Resistant Finish (Topcoat) (AMM 28-11-00/701).
 NOTE: A layer of corrosion resistant finish is necessary
____ only to protect bare (anodized) metal. It is not necessary to apply a layer of corrosion resistant finish on sealant. Corrosion resistant finish can be applied on sealant, but it is not necessary. Usually topcoat is applied to sealant only when it must be applied to protect adjacent bare metal.
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A 737-300/400/500MAINTENANCE MANUAL
CLASS A-2

Application of Precoat
Figure 804

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737-300/400/500MAINTENANCE MANUAL
 S 398-254
 (6)  Do these steps to repair bad fastener seals (SRM, 51-00-00/001) if it is necessary:
 (a)  Apply a precoat of BMS 5-26, Type II, Class A-2 sealant (correctly mixed) to the fastener and to the area 0.5 inch in all directions from the fastener.
 NOTE: Precoat is optional when you use Pro-Seal 860, B 1/6
____ sealant. Precoat is not used with PR-1826 or PR-1828 sealant.
 1)  Use a stiff, bristled brush to apply the precoat on the surfaces and into the cracks and holes.
 (b)  
Let the precoat dry until it is not tacky.

 (c)  
Apply a layer of BMS 5-26, Type II, Class B or Pro-Seal 860, B 1/6 sealant around and on the fastener.

 NOTE: Use a sealant gun or a spatula.
____

Apply a Fillet Seal
Figure 805

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PUSH SEALANT TIGHTLY INTO THE SEAM
Push the First Fillet Seal into the Seam
Figure 806

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(DO NOT PUT A BRIDGE ABOVE IT)
Re-Entrants Fillet Seal and Dimensions of Full Bodied Fillet Seals
Figure 807

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 (d)  
Move the sealant with a sealant fairing tool until you get the dimensions shown in Fig. 808 for the fillet seal.
　
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