Figure 30. - Mat Lay-Up

Figure 26. - Covering Repair Area with Separating Film

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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REPAIR INSTRUCTIONS USING FIBER GLASS MATERIAL Figure 30. - Mat Lay-Up 10. Allow the patch to harden; then pop it off (Figure 31) and remove the separating film. Figure 31. - Backing Patch 11. Working from the outside and using a file or grinder, taper the edges of the damaged area at an angle of no more than 45 degrees (Figure 32). Figure 32. - Tapering Edges (Crack Shown - Typical) 12. Remove flaky edges and feather the painted surface back about 1/2 inch beyond the damaged area by hand-sanding or power- sanding with 360 grit sandpaper (Figure 33). Figure 33. - Sanding Exterior Damaged Surface (Crack Shown - Typical) 13. Clean the area with a dry cloth or air. CAUTION - DO NOT WIPE WITH SOLVENT. 14. Sand the underside of the repair area with 80 grit (or less) sandpaper to create a rough bonding surface approximately 2 inches from the center of a crack (Figure 34) or 2 inches back from the edge of a fracture. Figure 34. - Sanding Underside of Repair Area (Crack Shown - Typical) 15. Trim the perimeter and sand the mating surface of the backing patch (Figure 35) with 80 grit sandpaper (or less), checking for smooth fit to the underside. Clean all surfaces with air. CTS-4049 Page 11

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