Cleaned buffed area. Use a dean cloth (item 16, table 2-11) dampened with acetone (item 3, table 2-11).
Wear gloves (item 4, table 2-11).
Mix adhesive in accordance with manufacturer's instructions, except do not mix full quantity
of Parts 2 and 3 with Part 1. The full contents of Parts 2 and 3 can be mixed together and then
used as necessary (mixed shelf life is 6 months). When mixing Parts 2 and 3 with Part 1, mix
only quantity needed to perform repair. Mixing ratio is 58.24% of Parts 2 and 3 (mixed
together) to 41.76% of Part 1.
Prepare repair adhesive (item 1, table 2-11) by blending the ingredients of Part 2 and 3 together first and
then transfer the mixture of Part 2 and 3 into the can of Part 1. Wear gloves (item 4, table 2-11).
Unmixed adhesive will not cure.
Stir adhesive mixture with tongue depressor (item 5, table 2-11) for approximately 5 minutes. Make
certain components are completely blended together.
When performing loose fitting flange and interior loose seam damage repairs dean, buff, dean and cement
loose flange contact surfaces and apply pressure with masking tape for at least a minimum of 12 hours. Remove
masking tape and clean area with acetone, using clean cloth (item 16, table 2-11). Wear gloves (item 4, table 2-11).
Carefully apply a thin uniform coat of adhesive mixture (1, figure 2-26) over buffed area (2) to no more
than 1/4 inch of O.D. of buffed area. Use a brush (item 6, table 2-11). Smooth surface with gloved fingers wet with
acetone (item 3, table 2-11). Remove any excess adhesive from unbuffed area. Use clean cloth (item 16, table 2-11)
dampened with acetone (item 3, table 2-11). Wear gloves (item 4, table 2-11).
Figure 2-26. Applying Adhesive Mixture Over Buffed Area
Do not flex fuel cell in repair area.
Allow finished repair to set for 1 hour before moving fuel cell.
Allow finished repair to air cure for 24 hour at room temperature of 70 °F (33°C) minimum before use.
Visually inspect repair for workmanship, no loose edges, no voids and adhesive fully cured.
Repair Fuel Cell Exterior Plies.
Acetone, barrier cement, repair adhesives and its components are flammable and toxic. They
can irritate skin and cause bums. Use only with adequate ventilation and wear a NIOSH
approved air-purifying respirator for organic vapors. Keep away from heat or open flame.
Wear safety glasses, gloves and protective clothing to avoid contact with skin, eyes and
clothes. If contact occurs, flush areas with water and get medical attention for eyes.
2-46 Change 2