TM 1-1500-204-23-3 NOTE If adhesive dry times are exceeded,    reapplication    of    one coat   of   adhesive   may   be   done only once (total of three coats).  If dry time is again exceeded, remove    adhesive    from    applied area using, acetone and/or buffing with emery cloth (120 grit minimum). (j)    With    a    one-inch    roller,    roll    over repaired  area  to  remove  any  trapped  air.    If  innerliner sticks to roller, dampen innerliner with  dean  cloth (item  16,  table  2-11)  dampened  with  acetone  (item  3, table  2-11).    Wear  gloves  (item  4,  table  2-11).    Allow cement to dry for 60 minutes minimum. (k)    Place  a  10  to  25  pound  shot  bag (item 23, table 2-11) on repair, if practical. Polyethylene,   waxed   paper   (item   24,   table   2-11)   or equivalent should be placed between the cemented area and  shot  bag  to  prevent  sticking  of  shot  bag  to  repair. Allow adhesive to dry 60 minutes minimum. (I)    Clean  innerliner  of  fuel  cell  at  least 1 3/4 inches larger in all directions around "Y" cut.  Use a   piece   of   dean   cheesecloth   (item   16,   table   2-11) dampened with acetone (item 3, table 2-11). (m)    Lightly,  hand  buff  innerliner  of  fuel cell around '"r or "Y" cut, 1 3/4 inches in all directions. (n)    Clean  buffed  area.    Use  a  piece  of dean  cheesecloth  (item  16,  table  2-11)  dampened  with acetone (item 3, table 2-11).  The surface must be dean and dry in order to apply patch. (o)    Cut  a  patch  from  fabric  (item  19, table 2-11).  The patch should be 1 1/2 inches larger in all directions around '" or "Y' cut.  Lightly, hand buff gum side  (side  with  dull  finish)  of  patch  with  emery  cloth (item  17,  table  2-11).    Remove  buffing  dust  by  wiping patch with cheesecloth (item 16, table 2-11) dampened with acetone (item 3, table 2-11).  Wear gloves (item 4, table 2-11). NOTE Do not apply adhesive beyond buffed areas. (p)    Apply   one   coat   of   adhesive   (item 18, table 2-11) to buffed side of patch and cell innerliner and allow to dry 20-60 minutes. (q)    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 test. (r)    If  necessary    to  restore  tack  of  the cemented surfaces, use a piece of cheesecloth (item 16, table 2-11) dampened with acetone (item 3, table 2-11) and lightly wipe over cemented areas.  Allow solvent to evaporate  10  to  20  seconds  or  until  cemented  areas become "tacky." Wear gloves (item 4, table 2-11). (s)    While  adhesive  is  still  tacky,  apply patch to cemented area of the cell innerliner, centering patch   over   damaged   area.      With   the   one-inch   roller (item 20, table 2-11), roll the patch to the cemented area and roll it down so as not to trap air between patch and innerliner. (t)    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),   or   equivalent   should   be placed  between  the  patch  and  force  applying  device  to prevent   sticking   of   the   force   applying   device   to   the repair. (u)    Allow  repair  to  remain  undisturbed for at least 8 hours.  The fuel cell should not be returned to service for 24 hours. (v)    Visually inspect repair for workmanship,  no  loose  edges,  no  voids,  and  adhesive fully cured.  If there is a defect in repair, recement per above procedure. Change 2  2-58