TM 1-1500-204-23-9 has not become contaminated, e.g., with dirt or grease: MIL-C-46168 coating fully cures in 7 days. p. Touchup   of   Polyurethane   System.        Closely inspect  candidate  areas  for  extent  of  damage  and/or touchup  required.    If  inspection  reveals  major  paint  or primer  failure  or  damage,  such  as  chipped  or  peeled paint,   the   involved   section   should   be   prepared   and touched up.  If only minor damage is found, e.g., paint chipped or missing from screw/rivet heads and on outer edges    of    skin    panel(s)    the    specific    area    may    be prepared  and  touched  up.    Prepare  damaged  area(s) and paint as follows: NOTE This    must    be    accomplished    with    full adherence   to   provisions   of   health   and safety cited elsewhere and herein. (1) Thoroughly clean area to be repainted. (2) Feather edges of coating adjacent to peel section  and  scuff  sand  the  other  area(s)  to  be  coated. Use   280   grit   paper   or   nylon   abrasive   matting,   MIL- A9962, very fine for scuff sanding. (3) Solvent wipe scuffed area(s) with thinner, MIL-T-19588. (4) Apply   one   thin   coat   of   epoxy   primer, MILP-23377   on   area   to   be   touched   up.      Power   Pak spray   unit,   MIL-S-22805,   may   be   a   valuable   aid   in accomplishing field touchup. (5) Apply   one   full   wet   coat   of   thoroughly mixed polyurethane topcoat.  If required, apply a second coat after allowing 1 to 4 hours curing period for the first coat. (6) Touch-up    shall    be    accomplished    with brush and rollers only in open areas. q. Inspection.        The    following    tests    provide    a measure of the quality of the painting job. (1) Viscosity test.  See MIL-F-18264. (2) Test  panel.    Prior  to  spraying  operations, the suitability of materials for the entire system shall be determined experimentally on a panel approximately 10 to  32  inches  in  size.    The  panel  shall  be  coated  under prevailing conditions with the finish system that is to be applied.  If the finish system applied to the experimental panel is satisfactory, full scale operations may begin. Defects  found  in  the  experimental  application  such  as blushing,     poor     adhesion,     excessive     orange     peel, sagging,   etc.   shall   be   corrected   prior   to   large   scale application. (3) Adhesion test.  See MIL-F-18264. (4) Gloss   test.      Not   applicable   to   MIL-C- 46168 paints.  See MIL-F-18264. (5) Smoothness test.  See MIL-F-18264. r. Storage  of  Painting  Supplies.    To  prevent  fire, spoilage,  and  waste  arising  from  improper  storage  and surplus     stock,     the     following     precautions     shall     be observed: WARNING ·   Space   heaters   or   other   direct   fired heaters    shall    not    be    used    to    heat storage areas.  Paints and thinners are flammable. ·  Floors  should  be  concrete  and  drained to one point; drain shall run to sump or detached  cistern  and  have  deep  trap. The  runoff  from  spilled  paint,  thinners, or catalysts can cause contamination to soil and water if not properly contained. · Ventilation shall utilize screened inlets 6 inches  above  floor  and  screened  vent through roof.  Fumes from thinners and catalysts  can  cause  sickness  and  may be explosive in concentrated amounts. (1) Paint  and  thinners  shall  be  stored  where possible   in   dry,   fire   resistant,   well   drained   and   well ventilated   structures,   preferably   separated   from   other buildings, and under automatic sprinkler protection. (2) To   avoid   possible   leakage   arising   from corrosion   of   containers,   protection   shall   be   provided against   wetting   by   rain,   snow,   steam   leaks,   or   other sources of water. (3) Supplies    shall    not    be    stored    in    the proximity   of   steam   lines   or   other   sources   of   heat   to avoid  direct  heat.    It  is  recommended  that  steam  heat be used with coils above stock and screened to prevent contact with drums or containers. 9-15