TM 1-1500-204-23-3 CAUTION Keep lid on can of barrier adhesive    when    not    in    use    to prevent evaporation and thickening. (j)    Carefully   apply   a   uniform   coat   of barrier  adhesive  in  one  direction  (1,  figure  2-32)  over previous  coat  of  repair  adhesive  mixture  (2).    Use  a brush (4).  Remove any excess adhesive from unbuffed area.      Use   a   dean   cloth   (item   16,   table   2-11)   and acetone (item 3, table 2-11).  Wear gloves (item 4, table 2-11 ).  Allow barrier to dry to touch. (k)    Apply    a    second    coat    of    barrier adhesive  (3)  over  first  coat  at  90 ° to  the  application  of the first coat.  Use a brush.  Allow second coat to air dry for 30 minutes. (I)    Prepare    repair    adhesive.        (See steps (f) and (g)). CAUTION When smoothing adhesive surface   with   gloved   fingers   wet with   acetone,   lightly   touch   only the surface of the adhesive. Insure  acetone  does  not  contact barrier cement previously applied, as the barrier cement is soluble in acetone.      Damage   to   the   barrier cement   can   result   in   the   barrier being damaged. (m)    Prepare   a   new   batch   of   adhesive (item   1,   table   2-11)   and   carefully   apply   a   uniform (liberal/heavy)  coat  of  repair  adhesive  (1,  figure  2-34) over    previous    coats    of    barrier    adhesive.        Smooth surface  with  gloved  fingers  wet  with  acetone  (item  3, table   2-11)   and   remove   any   excess   adhesive   from unbuffed  area  with  a  dean  cloth  (item  16,  table  2-11) and acetone (item 3, table 2-11).  Wear gloves (item 4, table 2-11). (n)    Wet  fabric  reinforcement  patch  (2) with  acetone  (item  3,  table  2-11).    Shake  out  excess acetone. (o)    Center  wet  patch  over  defect  area and  press  into  wet  adhesive  (1)  with  fingers  to  make certain patch is free of air bubbles and loose edges. Figure 2-34.  Centering Wet Patch (p)    Allow cement and fabric patch to air cure approximately 30 minutes. CAUTION When smoothing adhesive surface   with   gloved   fingers   wet with   acetone,   lightly   touch   only the surface of the adhesive. Insure  acetone  does  not  contact barrier cement previously applied, as the barrier cement is soluble in acetone.      Damage   to   the   barrier cement   can   result   in   the   barrier being damaged. (q)    Prepare   a   new   batch   of   adhesive (item 1, table 2-11 ) and carefully apply a uniform coat of repair adhesive (1, figure 2-30) over patched area to within  no  more  than  1/8  inch  of  O.D.    of  buffed  edge. Smooth  surface  with  gloved  fingers  wet  with  acetone (item  3,  table  2-11).    Use  a  brush  (item  6,  table  2-11). Remove   any   excess   adhesive   with   cloths   dampened with acetone (item 3, table 2-11).  Wear gloves (item 4, table 2-11). CAUTION Do not flex cell in repair area. (r)    Allow   finished   repair   to   set   for   1 hour before moving fuel cell. Change 2  2-52