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BODIES AND CABS FIBERGLASS REPAIR INSTRUCTIONS
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SAFETY PRECAUTIONS - TM-5-4210-230-14P-1_352
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS GENERAL The   information   contained   in   this   manual   section   has been   prepared   to   provide   service   personnel   with   a   ready reference    to    step-by-step    procedures    for    the    repair    or replacement of fiberglass components. Instructions  for  making  fiberglass  repairs  to  sheet  metal are also covered in this section. A fiberglass reinforced plastic repair kit (Fig. 1) has been made  available  which  contains  the  material  needed  to  repair either fiberglass or sheet metal components.  This kit may be obtained through regular Service Part channels. The  mixing  directions  for  the  resin  mixture  and  plastic putty are found on the cans. CAUTION Do not put mixed material back into cans. Fig. 1.  Fiberglass Repair Kit. Legend for Fig. 1 Key Description 1 CLOTH 2 PLASTIC FILLER 3 PLASTIC ACTIVATOR 4 RESIN ACTIVATOR 5 RESIN 6 MIXING CUP (3) 7 MAT 8 SQUEEGEE (1-1/2" x 2") 9 SQUEEGEE (1-1/2" x 1") 10 PAINT BRUSH 11 STIRRING STICK 12 STIRRING STICK DESCRIPTION Fiberglass  is  manufactured  from  filaments  of  pure  glass spun  into  yarn  then  either  woven  into  a  fabric  (cloth)  or  a loosely bound mat.  The cloth or mat is then saturated with a resin.    When  the  resin  cures  (hardens)  it  acts  as  a  binder  to hold the fiberglass together, thus forming a solid panel. Fiberglass  components,  such  as  the  hood  with  fenders assembly,  are  formed  from  laminated  sheets  of  fiberglass mats  held  together  with  a  synthetic  resin.    When  the  liquid resin mix cures (hardens) it binds the filaments of glass in the fiberglass mat creates a solid panel.  The glass fiber provides the strength in the panel while the resin bonds the glass fibers together   and   supplies   only   a   limited   additional   amount   of strength.  Therefore when repairing a section, be sure to cover more than just the hole where the damaged material has been removed.      Always   overlap   the   undamaged   portion   with fiberglass   patches,   so   that   a   more   continuous   sheet   of reinforced fiberglass results. Since the material hardens by a chemical action, a hard surface  indicates  a  hard  interior,  ready  for  finishing.    The mixture becomes hot before reaching setting temperature and then  it  begins  to  harden.    It  reaches  full  hardness  after  48 hours.  It can however be sanded and finished before then. To hasten the curing action or if the working temperature is below 60° F, hold a heat lamp approximately 18" from work. NOTE 250°   F  to  275°   F   is   the   high   limit   for   the material  and  to  go  higher  might  distort  the fiberglass  form  you  are  patching.  Therefore, keep  a  close  control  over  the  external  heat supply.      Cooler   temperature   increases   the working time and hardening time. The    paint    refinishing    method    is    the    same    as    that recommended   for   metal   parts   with   the   exception   that   the temperature must be kept below 250° F, which means the air dry  process  is  the  most  practical  method.  Either  enamels  or lacquers may be used to paint the fiberglass. TOOLS AND EQUIPMENT NEEDED Tools   and   equipment   necessary   to   make   repairs   on fiberglass are as follows: IH Repair Kit (Fig. 1) Putty Knife Electrical Drill and Bits Electrical Grinder or Sander Respirator "C" Clamps Hacksaw Blades and Holder Files Acetone or Lacquer Thinner CTS-2408  Page 2 PRINTED IN UNITED STATES OF AMERICA

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