(b)
Tetrahydrofuran -200 grams
(c)
Cyclohexanone - 200 grams
(d)
Scrap material (Boltaron, Royalite, Vinyl) - 85-130 grams
(e)
Adhesive - General Electric RTV-174
(f)
White Silk Screen Vinyl Ink - BAC712, 50 grams (vinyl ink is used only to match BAC712 white)
(3)
Repair: (Touchup Solution)
(a) Mix touchup solution as follows: 1) From scrap of the same type and color material to be repaired, cut quantity of
small pieces.
2) Measure equal portions by weight of Tetrahydrofuran and Cyclohexanone.
3) Pour Tetrahydrofuran into quart can (with seal-tight lid).
4) Combine one half of cut scrap material in can with Tetrahydrofuran and put on
mechanical agitator (paint shaker). Scrap material will dissolve in 5 to 15
minutes depending on temperature of solvent.
5) When first half of scrap material is dissolved, add Cyclohexanone and other half of cut scrap material to solution. Continue agitation until all of scrap material is dissolved. Since specific properties of these scrap materials vary, it may be necessary to make adjustments in solvent (equal parts of Tetrahydrofuran and Cyclohexanone) and/or scrap material proportions in order to obtain desired viscosity.
6) There is a slight difference in touch-up solution after formulation when compared to basic vinyl color. This factor (when important) may be corrected by addition of 50 grams of silkscreen vinyl ink of required BAC color to one quart of touch-up solution.
7) When solution is stored for any length of time, it may gel slightly. Addition of a small amount of equal parts of Cyclohexanone and Tetrahydrofuran to solution and agitation will restore it to proper viscosity.
8) Very small cracks, cuts, or slits may be touched up using an artist's brush and touch-up solution. Quality of repair will depend upon the skill of repairman. Repair of silk screened rigid vinyl shall be performed as follows: a) Sufficient touch-up solution shall be applied, in the form of a bead, to crack,
cut, or slit in cleaned decorative material. Bead shall be approximately 1/16 of an inch higher than surface texture of damaged material.
b) When material has cured but can still be dented with fingernail, a razor blade shall be held flat against surface of damaged material and bead cut off.
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25-00-11 Page 208 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/83
(4) Repair Using RTV-174 Adhesive (Alternate Method)
(a)
Clean decorative surfaces in area to be repaired using cleaning methods No. 1, 3, or
4.
(b)
Mask edges of repair areas.
(c)
Extrude a small quantity of RTV-174 adhesive into a clean container.
(d)
Mix one or two drops of semigloss lacquer or vinyl ink with RTV-174 adhesive to provide a color match with material to be repaired.
(e)
Apply small amount of mixture to a sample of material to be repaired and check for color match.
(f)
Adjust color as necessary by adding more tint or adhesive.
(g)
Apply color-matched adhesive with an artist's brush to fill small cracks, cuts or slits in decorative material. Use color-matched adhesive as soon as possible after preparation.
(h)
Allow adhesive to cure for 2 to 4 hours at 70°F or for 60 to 90 minutes at 120 +10°F. Quality of repair will depend upon the skill of repairman.
D. Repair Method No. 3
(1)
General
(a) This method is used to repair cracks, cuts, or slits in decorative material.
(2)
Equipment and Materials
(a)
Ungar soldering iron (with shaped tip)
(b)
Variable Autotransformer - Powerstat type 116 (powerstat setting 120 to 125)
(c)
Shaped Tips for Soldering Iron - Copper, chrome plated (Fig. 202)
NOTE: Tip used will depend upon type and location of damage and skill of repairman.
(3) Repair (Heat Fused Patch):
(a)
After cleaning damaged area, cut piece of material same size, color, shade, and surface texture as damaged material.
(b)
Place patch in damaged area.
(c)
Using soldering iron with shaped tip, point heat fuse decorative patch to match surrounding material.
(d)
After damaged material has been heated sufficiently to flow, patch shall be fused to surrounding material, using stippling motion.
NOTE: Quality of re-embossing will depend upon skill of operator.
(e)
A patch that is over 1/8 inch wide shall be bonded with appropriate adhesive as called out on engineering drawing prior to heat fusing operation.
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