TM 1-1520-240-BD b. Removal   of   Antichafing   Tape.      Rejected   or improperly applied tape should be removed as follows: WARNING Methyl-ethyl-ketone is toxic.  Work in a well ventilated area.  Avoid inhaling fumes   and   prolonged   contact   with the    skin.        Wash    thoroughly    after using.  Wear protective clothing. (1) Saturate   tape   with   methyl-ethyl-ketone. Allow  a  few  minutes  for  tape  to  soak.    Then,  carefully peel tape from surface. (2) Apply  new  tape.    Refer  to  paragraph  2- 14a. c. Application  of  Velcro  Tape.    This  procedure  is used  for  the  application  of  precoated  adhesive-backed or uncoated Velcro hook and pile tape.  This fastener is used    for    attachment    and    repair    of    sound-proofing blankets and coverings. (1) Clean   surface   to   which   tape   is   to   be applied.   Use   cloths   soaked   with   solvent   (item   144, Appendix    C).    Wipe    surface    with    dry    cloths    before solvent evaporates. (2) Apply  masking  tape  (item  145,  Appendix C) around surface to be covered. NOTE For  best  results  surface  should  be bare of prime-coat. (3) Brush    a    coat    of    adhesive    (item    41, Appendix C) on masked surface and tape. NOTE The shelf life of adhesive and tape is 6 months when stored at 60^o to 80°  F (16° to 27^oC). (4) Press  tape  in  place  within  5  minutes  of adhesive application, but not sooner than 1 minute. (5) If tape is too long, insert a piece of wood between  tape  and  coated  surface.    Trim  tape  with  a sharp knife. NOTE Tape  must  be  applied  to  fabrics  by stitching with nylon thread in accordance with Fed. Std. 751. (6) Check  for  acceptable  bonding  by  gently pulling edges of tape with fingernail. NOTE Small  voids  around  rivet  and  screw heads are permissible. 2-15.  APPLICATION  OF  FILLERS .    Refer  to  TM  55- 1520-240-23. 2-16.  TYPICAL  REPAIRS.    Subsequent  text  contains procedures     for,     and     referenced     illustrations     show examples  of  oilcan  repair,  material  substitution,  repairs for    skin    and    web,    formed    parts,    extruded    parts, attachment holes, eliminating gaps and leveling installations,   spotwelded   parts,   canvas   and   webbing, aluminum   tubing,   rubber   seals,   hinges,   and   restoring transparent  plastics.    In  most  cases,  these  procedures and    examples    are    referenced    from    specific    repair paragraphs  and  figures  throughout  the  manual.    They are to be used as a guide when making repairs.  If the procedures  and  examples  are  not  referenced,  they  can be used within limitations noted. a. Oilcan      Repair.      Loose      skins,   skins   having unacceptable    oilcans,    and    trapped    skin    should    be repaired as directed in subsequent paragraphs.  Repair to   the   body   skin   below   waterline   0   must   be   sealed watertight. (1) Trapped skin, evidenced by an outward or inward  bulge  between  attaching  hardware  and  caused by    improper    repair    techniques    is    not    acceptable. Correct  this  condition  by  removing  attaching  hardware as   required   allowing   skin   to   shift,   and   installing   next larger size fasteners. (2) Loose skins and skins having unacceptable  oilcan  should  be  repaired  using  stiffeners with the following exceptions: (a) Stiffeners   are   not   permitted   within area on bottom of cabin fuselage section between lower longer-ons and sta 160 and 482. (b) Stiffeners are not permitted externally on the helicopter. 2-58