(i)
Lacquer thinner
(j)
Methyl chloride
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(3) Repair Smooth or Scraped Areas
(a) Prepare silicone replica of surface adjacent to area being repaired: 1) Clean surface which is to be copied per cleaning method No. 1, 2 or 3. 2) Construct a frame, approximately 3/8 inch wide by 1/2 inch high, around clean
surface to be copied.
NOTE: Wood, clay, or high temperature vacuum sealant tape may be used to construct frame.
3) Brush thin layer of prepared silicone rubber onto textured surface within frame. Continue brushing until no air bubbles are visible.
NOTE: Almost any brand, type, or color of castable silicone rubber may be used except dark red varieties which contain finely divided iron oxide. Dow Corning Silastic RTV "B", "E", 587, 93072 or 93079 and General Electric RTV 41 or RTV 631 are suggested for use. Prepare silicone rubbers for use per manufacturer's instructions.
4) Pour remaining silicone rubber onto brushed surface to a thickness of 1/4 inch and allow to cure at room temperature for 48 hours.
NOTE: One pound of prepared silicone rubber will make a 10- by 10- by 1/4-inch replica.
5) After cure, peel silicone replica from textured surface.
(b)
Soften damaged decorative surface with methyl ethyl ketone for 1 to 2 minutes.
(c)
Apply textured silicone rubber replica to softened area and hold in position for 1 to 2 minutes.
(d)
Remove silicone rubber replica and allow decorative material to harden.
(e)
Remove surface gloss from decorative surface by rubbing with a pencil eraser.
(4) Repair Cuts and Gouges that do not Penetrate Decorative Material
(a) Prepare repair paste. 1) From scrap material of same type and color material to be repaired, cut quantity of small pieces. 2) Pour methyl chloride into a pint or quart can (with seal-tight lid) until can is 1/2 to
2/3 full. 3) Fill can containing methyl chloride with cut scrap material and install lid on can.
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4) Put can on mechanical agitator (paint shaker) and agitate until scrap material has dissolved to a smooth paste.
5) Add more methyl chloride or scrap material and agitate to obtain desired consistency.
NOTE: If desired, up to 50% lacquer thinner can be added to slow drying time of mixture.
(b)
Fill cut or gouge with repair paste flush with decorative surface and allow paste to dry.
(c)
If repair paste shrinks during drying, repeat step (b) as required.
(d)
If necessary, retexture decorative surface using procedure in step (3).
(5)
Repair Small Holes
(a)
Prepare repair paste as described in step (4)(a).
(b)
Place masking tape over hole on decorative side of panel.
(c)
Fill hole from the nondecorative side with repair paste and allow paste to dry.
(d)
If repair paste shrinks during drying, repeat step (c) as required.
(e)
Retexture repaired hole in decorative surface using procedure in step (3).
(6)
Repair Large Holes (Repair Paste Method)
(a)
Prepare repair paste as described in step (4)(a).
(b)
Place cloth-backed masking tape over hole on nondecorative side of the panel.
(c)
Fill hole from decorative side with repair paste and allow paste to dry.
(d)
If repair paste shrinks during drying, repeat step (3) as necessary.
(e)
Retexture repaired hole in decorative surface using procedure in step (3).
(7)
Repair Large Holes (Epoxy Method)
(a)
Form an aluminum plate to contour of panel to be repaired.
(b)
Wrap aluminum plate with polyvinyl film.
(c)
Thoroughly mix the following materials: 100 parts by weight: Epibond 126 65 parts by weight: HN 9812 Hardener 15 parts by weight: Calcium Carbonate
(d)
Impregnate Volan No. 128 glass cloth with above mixture.
(e)
Lay impregnated glass cloth over hole in nondecorative side of damaged part.
(f)
Clamp aluminum plate over glass cloth.
(g)
Complete repair in accordance with Repair Method No. 5.
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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