TM 1-1520-240-BD (10) Join  coated  surfaces  immediately.    Hold them   together   gently   for   15   to   30   seconds   before applying pressure. (11) Apply   equally   distributed   pressure   with clamps. (12) Scrape excess cement onto masked area. (13) Allow assembly to set for 2 hours. (14) Remove clamps.  Allow assembly to cure for 2 hours at a minimum of 70°F (21°C). (15) For final cure, allow assembly to set for 4 hours at 148^oF (64^oC). 2-14.  APPLICATION OF TAPES . Subsequent paragraphs   contain   information   on   the   various   tapes used on the structure and component parts. a. Application  of  Antichafing  Tape.    This  tape  is used  if  a  smooth,  nonabrasive  surface  is  desired  over rivet heads and seams. CAUTION Exposure     of     antichafing     tape     to sunlight  for  4  hours  will  destroy  its adhesive qualifies. Storage of unused tape should be in a cool dark area. (1) Remove all burrs, rough and sharp edges, and loose primer in area to be taped. (2) Using   an   air   blast,   brush   or   dry   cloth, remove loose metal clips, dust, and primer scale. (3) Using   a   cloth   moistened   with   naphtha, wipe all surfaces to be taped. NOTE Solvent     may     be     substituted     for naphtha.  The solvent must be wiped dry and not allowed to evaporate on surfaces. (4) Repeat step c.  at least two times or until the surfaces are clean. (5) Cut a length of tape as follows: (a) if  protrusions  are  less  than  1/4-inch high, the tape should be cut to extend 1 to 2 inches each side of protrusion. (b) If  protrusions  are  higher  than  1/4- inch, the tape should be cut to extend 1-1/2 to 2 inches each side of protrusion. NOTE Lengths   of   tape   should   be   cut   to allow protective paper line to extend beyond cut edge. This   will   make   it   easier   to   remove tape.      Continuous   lengths   of   tape should be used whenever possible. (6) Remove   liner   from   tape.   The   activator may     have     a     harmful     effect     on     some     materials. Therefore,  precautionary  measures  should  be  taken  to prevent activator or items dampened with activator from contacting other materials. (7) Pour a sufficient amount of activator (item 16, Appendix C) into a pan. (8) Use a wooden applicator to apply activator   with   a   wiping   motion.      Apply   activator   to adhesive side of tape. (9) Apply  activated  tape  to  cleaned  surfaces by starting tape at one end and pressing it down firmly. Smooth tape down with a wooden scraper and work tape from center to edge with sufficient pressure to eliminate air pockets and wrinkles and to ensure good adhesion. NOTE All  edges  must  be  firmly  bonded  to surface.    Small    blisters    and    voids must  be  kept  to  a  minimum.    Voids around   rivet   and   screw   heads   are permissible. 2-57