(i) Apply a second coat of adhesive
(item 18, table 2-11) to buffed areas of patch and cell
innerliner and allow to dry until tacky. Adhesive can
become tacky within 2 to 4 minutes, depending on
ambient temperature and humidity. Perform knuckle
exceeded, reapplication of one
coat of adhesive may be done
only once (total of three coats). If
remove adhesive from applied
area using, acetone and/or buffing
(j) If necessary to restore tack to the
cemented surfaces, use a piece of clean cheesecloth
(item 16, table 2-11) dampened with acetone (item 3,
table 2-11), lightly wipe over cemented areas. Allow
solvent to evaporate 10 to 20 seconds or until cemented
areas become "tacky."
(k) While adhesive is still tacky, apply
patch to cemented area of the cell surface, centering
patch over damaged area, in both length and width
directions. With the one-inch roller (item 20, table 2-
11), roll the patch to the cemented area and roll it down
a 1/2 inch to 1 inch across at a time so as not to trap air
between patch and fuel cell surface.
(l) Place a 10 to 25 pound force by
damping (C-clamp (item 21, table 2-11) and two pieces
of wood (item 22, table 2-11)), shot bag (item 23, table
2-11), etc., if practical on repair. Polyethylene, waxed
paper (item 24, table 2-11) should be placed between
the patch and force applying device to prevent sticking
of the force applying device to the repair.
(m) Allow repair to remain undisturbed
for at least 8 hours. The fuel cell should not be returned
to service for 24 hours.
workmanship, no loose edges, no voids, and adhesive
fully cured. If there is a defect in repair, recement per
Internal and External Cuts, Tears,
Chafing, Scuffs, or Snags Coating Missing, Cord/Fabric
Exposed But Not Torn.
Acetone and repair adhesives are
flammable and toxic. Keep away
from heat, sparks and open flame.
Wear safety glasses, gloves and
protective clothing to prevent
contact. Wear a NIOSH approved
air-purifying respirator for organic
ventilated area. If contact occurs,
flush areas with water and get
medical attention. If ingestion
occurs get medical attention at
(a) Clean damaged area using a piece
of dean cheesecloth (item 16, table 2-11) dampened
with acetone (item 3, table 2-11). Wear gloves (item 4,
Do not buff exposed fabric. If
during buffing, fabric becomes
exposed, stop buffing that area.
Continue to buff around exposed
fabric, as required.
(b) Lightly, hand buff damaged area
using emery cloth (120 grit) (item 17, table 2-11).
Clean buffed area using a piece of
dean cheesecloth (item 16, table 2-11) dampened with
acetone (item 3, table 2-11). Wear gloves (item 4, table
(d) Brush coat buffed area with one
coat of adhesive and allow to dry 20-60 minutes.
(e) Apply a second coat of adhesive to
(f) Allow repair to remain undisturbed
for at least 8 hours.
Change 2 2-61