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____ the date of manufacture, if they were stored in accordance with standard industry practices. They can also be used if tests at 12 and 18 months from the date of manufacture show that they agree with specifications. Discard materials more than 2 years old.
 Caapcoat comes as a kit, including primer, corrosion coating and thinner.
 BMS 10-79 primer comes as a two-component kit. Before you mix the components together, shake each component sufficiently to mix all solids. Then add and stir continuously (Ratio 1 part base to 1 part catalyst by volume. Use thinner as applicable). Let the mixture stand a minimum of 30 minutes before application.
 S 378-013
 (2)  Apply primers and coatings by spray only.
 NOTE: On the primer coat if the film is rough, lightly sand with
____ 180 grit or finer aluminum oxide abrasive paper or pad before you apply the overcoat. Remove sanding residues with wipers lightly dampened with solvents.
 S 378-015
 (3)  Apply materials to get the dry film thickness per Fig. 802.
 NOTE: Make sure that between application of coats, you allow enough
____ time to flush off the solvents because of the thickness requirements of the Caapcoat erosion coating. If you follow these instructions, you will prevent appearance of bubbles and get a better finish.
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747-400 MAINTENANCE MANUAL
 H. Minor Repair to Topcoats of the RERC
 S 348-021
 (1)  
The two sets of instructions that follow should be used if there is minor damage to the RERC, and/or the fiberglass of the leading edge, and/or the primer.

 S 348-014

 (2)  
If the RERC is damaged and the fiberglass of the LE is not damaged and the primer is intact repair as follows:

 CAUTION:_______AVOID EXPOSURE OF PRIMER OR FIBERGLASS SUBSTRATE. IF FIBERGLASS SUBSTRATE IS EXPOSED, APPLY PRIMER. DO NOT APPLY PRIMER OVER EXISTING POLYURETHANE.
 (a)  
Trim or sand to remove all loosened coatings.

 (b)  
Make the area smooth and feather the edges by sanding.

 NOTE:____Use 280 grit or finer abrasive. A high-speed disk sander is recommended.

 (c)  
Vacuum thoroughly to remove sanding dust.

 (d)  
Just before you begin to apply the coating, wipe the sanded area with thinner. 1) Repeat the solvent wipe and use a clean wiper until there

 is no visible pick-up of particles or discoloration. 2) Wipe dry with a clean wiper.

 (e)  
Brush apply the appropriate polyurethane coatings to the required thicknesses.

 NOTE: Prevent any overlap of this coating onto the unsanded
____ area of the existing coating.
 (f)  
Make sure that the final finish is smooth, continuous and has no particles in it.

 (g)  
Make sure that the dry film thickness is within the limits of Fig. 802 and the coatings conform to the contour of the part.

 S 348-016
 (3)  If the RERC, primer and fiberglass of the Leading Edge is exposed repair as follows:
 (a)  
If a small damaged areas exits where primer or epoxy fiberglass substrate is exposed, trim to remove significant amounts of loosened coatings.

 (b)  
Use sandpaper to remove the remaining, loosened coating.

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 (c)  Make the area smooth the feather the edges of the sound coating.
 NOTE:____ Do not expose glass fabric during sanding operation.
 (d) (e) (f)  Rub the repaired area with a bristle brush and solvent, Series 87 (AMM 20-30-87) for a minimum of 1 minute.With a dry, clean cloth blot-dry, then dry brush and vaccuum to remove loose particles.Apply BMS10-79 primer and Caapcoat kit with a brush to the required thicknesses.
 NOTE:____ Do not apply primer over existing polyurethane coating.
 (g) (h)  Make sure that the final finish is smooth, continuous and has no particles in it.Make sure that the dry film thickness is within the limits of Fig. 802 and the coatings conform to the contour of the part.
　
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