NOTE:  Color matching of patch materials is of primary importance. Mismatching of color will tend to make patch repair very apparent. Since different rolls of same decorative material will have slight color variances, extreme care should be taken in selecting material for each repair. Of secondary importance is matching material design and texture as closely as possible. Improper design or texture matching will also make repaired area apparent.

(b)  
Sufficient double-backed tape (Permacel No. 94) shall be applied over damaged area to hold patch material securely while patch cutout is made.

(c)  
Patch material shall then be carefully aligned (design and texture) over damaged area and pressed down firmly onto double-backed tape.

NOTE:  It is very important that patch material be indexed and registered in line with damaged area as closely as possible.

(d)  
Shape of patch shall be as shown in Fig. 203.

NOTE:  Several shapes and sizes of patches have been evaluated to determine which configuration blended best with textured vinyl surfaces. "Cup cake" patch (Fig. 202) has proved to have best "hiding power" of any of configurations tested.

(e)  
Patch for those materials which have geometric designs shall be cut following design or pattern of material.

NOTE:  It is extremely important to align design of patch material to damaged material. If patch cutout does not match damaged area, mismatch will not be acceptable from an appearance standpoint.

(f)  
Position of "cup cake" patch's indexing line shall be as follows: 1) When patch repairing "grass cloth" embossing (10-60199-103, -105, -136, -148, -158 -162, -185 and -1002), indexing line of "cup cake" patch shall always be perpendicular (at right angles or 90 degrees) to direction of lines in surface texture of damaged material.

(g)  
When patch repairing all other types of surface textures (embossing), position of cup cake patch's indexing line will be to discretion of repairman.

(h)  
Patch material and damaged material shall be cut through simultaneously using an X-Acto No. 1 knife with an X-Acto No. 11 blade only.

NOTE:  It is very important that knife blade be sharp and held perpendicular to repair when cutting out patch. If knife is slanted or held at an angle, result will be an undersized or oversized patch. If this occurs, a new and larger patch must be made.

(i)  
Patch and damaged material shall then be removed. Old adhesive shall then be removed by sanding or scraping.

NOTE:  If old adhesive is not removed, it may cause patch to be high and not acceptable from an appearance standpoint.

(j)  
Area to be patched shall be cleaned with ethyl alcohol and water in accordance with Cleaning Method III.

(k)  
A light film of Eastman 910 adhesive shall be applied to sides and surface of area to be patched. A small spatula shall be used to spread adhesive.

NOTE:  Do not apply an excessive amount of adhesive as an excess will inhibit cure. Eastman 910 adhesive shall be kept in a closed container when not in use and preferably stored in a cool place.

(l)  
Using indexing line, patch shall be aligned and worked down lightly and progressively at all edges (do not apply pressure at this point). When patch edges are in place, X-Acto knife handle shall be used to roll down patch tightly. Work from center of patch to edges until patch is free of air inclusions, wrinkles, and all edges are down evenly.

(m)  
Maximum hand pressure shall then be applied until a bond is assured (approximately 60 seconds).

(n)  
Remove double-backed tape.

559 
25-00-11 Page 214  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/76 

559  Typical Patch Shape (Repair Method No. 6) 
Aug 15/76  Figure 203  25-00-11 
Page 215 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

H.  Repair Method No. 7
(1) 
 General

(a)  This method is used for retexturing and repair of scrapes, cuts, gouges and holes in Boltaron, Royalite, Cycolac, and Kydex decorative material.

(2)  
Equipment and Materials

(a)  
Polyvinyl alcohol film

(b) 
 Epibond 126

(c)  
Hardener - HN 9812

(d) 
 Calcium carbonate

(e)  
Glass Cloth - Volan No. 128

(f)  
Methyl ethyl ketone

(g)  
Silicone Rubber - Dow Corning RTV "B", "E" 587, 93072 or 93079, General Electric RTV 41 or RTV 631

(h)  
Scrap Material (Boltaron, Royalite, Cycolac or Kydex)
　
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