TM 1-1520-240-BD (2) Brush or spray a thin coat of primer (item 111, Table 2-5) on all bonding surfaces, except silicone rubber. (3) Allow primer to dry for 30 minutes. (4) Prepare    required    amount    of    adhesive (item 32, Table 2-5) by adding 16 drops of catalyst (item 32, Table 2-5) to 1/2 ounce of adhesive.  Stir adhesive constantly while adding catalyst. NOTE The  pot  life  of  catalyzed  adhesive  is 2 to 4 hours. (5) Brush     a     uniform     coat     of     catalyzed adhesive  on  all  faying  surfaces.    Allow  adhesive  to  air dry approximately 30 minutes or until tacky. (6) To  ensure  solid  contact  and  removal  of entrapped    air,    join    faying    surfaces    with    moderate pressure. (7) Remove    pressure    and    cure    adhesive bond  for  24  hours  at  70°F  (21°C).    Maximum  bond strength is achieved in 4 to 7 days. j. Application of Adhesive System No.  8. WARNING The adhesives under this system are toxic  and  flammable.    Work  only  in well-ventilated areas away from flame. (1) (Refer  to  Table  2-5  for  list  of  acceptable adhesives.) Clean all faying surfaces using methyl-ethyl- ketone. (2) Brush  or  spray  a  liberal  coat  of  primer (item  118,  Table  2-5)  on  all  bonding  surfaces  except silicone rubber. (3) Allow    primer    to    dry    for    at    least    30 minutes. (4) Apply a uniform layer of adhesive to both surfaces; immediately join surfaces. (5) Apply  sufficient  pressure  to  ensure  solid contact but not enough to cause excessive squeeze out. NOTE A   bond   line   thickness   of   at   least 0.015 inch will give best results. (6) Allow  adhesive  to  cure  under  contact pressure  for  24  hours  at  60    to  70°  F  (21  °  to  27  C). Maximum  strength  is  achieved  after  approximately  3 days. k. Application  of  Adhesive  System  No.    9  (Option 1). WARNING The   adhesives   under   this   system may  produce  skin  irritation.    Avoid bodily contact with the adhesives. NOTE The   acceptable   adhesives   given   in Table  2-5  for  this  adhesive  system replace adhesives Epon VI and Epon VIII  (items  28  and  29,  Appendix  C). Existing   stocks   of   these   replaced adhesives may be used until depleted. (1) (Refer  to  Table  2-5  for  list  of  acceptable adhesives.)  Clean  faying  surfaces  using  methyl-ethyl- ketone. (2) Thoroughly blend 100 parts, by weight, of base with 16.5 parts, by weight, of catalyst. (3) Apply thin coat of adhesive to both faying surfaces, using a spatula. (4) Join  parts,  applying  sufficient  pressure  to ensure solid contact. NOTE A     continuous     bead     of     adhesive squeeze  out  indicates  solid  contact (5)   Remove   excess   adhesive   using methyl-ethyl-ketone. (6) Allow  adhesive  to  cure  for  12  hours  at 70°F (21 °C), for 2 hours at 125°F (52°C), or 1 hour at 200°F (93⁰C). 2-54