Internal and External Cuts, Tears, Chafing, Scuffs, or Snags Coating Missing, Cord/Fabric Exposed But Not Torn

TM 1-1500-204-23-3 (i) Apply a second coat of adhesive (item 18, table 2-11) to buffed areas of patch and cell innerliner and allow to dry until tacky. Adhesive can become tacky within 2 to 4 minutes, depending on ambient temperature and humidity. Perform knuckle test. NOTE If adhesive dry times are exceeded, reapplication of one coat of adhesive may be done only once (total of three coats). If dry time is again exceeded, remove adhesive from applied area using, acetone and/or buffing with emery cloth (120 grit minimum). (j) If necessary to restore tack to the cemented surfaces, use a piece of clean cheesecloth (item 16, table 2-11) dampened with acetone (item 3, table 2-11), lightly wipe over cemented areas. Allow solvent to evaporate 10 to 20 seconds or until cemented areas become "tacky." (k) While adhesive is still tacky, apply patch to cemented area of the cell surface, centering patch over damaged area, in both length and width directions. With the one-inch roller (item 20, table 2- 11), roll the patch to the cemented area and roll it down a 1/2 inch to 1 inch across at a time so as not to trap air between patch and fuel cell surface. (l) Place a 10 to 25 pound force by damping (C-clamp (item 21, table 2-11) and two pieces of wood (item 22, table 2-11)), shot bag (item 23, table 2-11), etc., if practical on repair. Polyethylene, waxed paper (item 24, table 2-11) should be placed between the patch and force applying device to prevent sticking of the force applying device to the repair. (m) Allow repair to remain undisturbed for at least 8 hours. The fuel cell should not be returned to service for 24 hours. (n) Visually inspect repair for workmanship, no loose edges, no voids, and adhesive fully cured. If there is a defect in repair, recement per above procedure. (4) Internal and External Cuts, Tears, Chafing, Scuffs, or Snags Coating Missing, Cord/Fabric Exposed But Not Torn. WARNING Acetone and repair adhesives are flammable and toxic. Keep away from heat, sparks and open flame. Wear safety glasses, gloves and protective clothing to prevent contact. Wear a NIOSH approved air-purifying respirator for organic vapors and work in a well ventilated area. If contact occurs, flush areas with water and get medical attention. If ingestion occurs get medical attention at once. (a) Clean damaged area using a piece of dean cheesecloth (item 16, table 2-11) dampened with acetone (item 3, table 2-11). Wear gloves (item 4, table 2-11). NOTE Do not buff exposed fabric. If during buffing, fabric becomes exposed, stop buffing that area. Continue to buff around exposed fabric, as required. (b) Lightly, hand buff damaged area using emery cloth (120 grit) (item 17, table 2-11). (c) Clean buffed area using a piece of dean cheesecloth (item 16, table 2-11) dampened with acetone (item 3, table 2-11). Wear gloves (item 4, table 2-11). (d) Brush coat buffed area with one coat of adhesive and allow to dry 20-60 minutes. (e) Apply a second coat of adhesive to buffed area. (f) Allow repair to remain undisturbed for at least 8 hours. Change 2 2-61