TM 1-1500-204-23-3 (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 test. 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)    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. (n)    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. (4) Internal  and  External  Cuts,  Tears, Chafing, Scuffs, or Snags Coating Missing, Cord/Fabric Exposed But Not Torn. WARNING 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 vapors and work in a well ventilated area.  If contact occurs, flush   areas   with   water   and   get medical   attention.      If   ingestion occurs   get   medical   attention   at once. (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, table 2-11). NOTE 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). (c) 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 2-11). (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 buffed area. (f)    Allow  repair  to  remain  undisturbed for at least 8 hours. Change 2  2-61