REPAIR INSTRUCTIONS USING FIBER GLASS MATERIALSTRUCTURAL REPAIRSThe procedures given under Structural Repairs are usedfor repairing various types of damage to the fiber glasslaminate cracks, large and small fractures, panelseparation, etc. that can affect the structural soundnessof the laminate.Cracks, Small and Large FracturesCracks, small fractures and large fractures are identifiedas follows: A crack is an obvious separation extendingcompletely through the laminate (Figure 18). Cracks,which result from stress beyond normal operation, canoccur in the center of the laminate or extend from thelaminate edge.Figure 18. - CrackSmall fractures are punctures that are 3 inches or less insize (Figure 19).Figure 19. - Small FracturesLarge fractures are punctures that are 3 inches or morein length (Figure 20).Figure 20. - Large FracturesCracks, small fractures and large fractures are repairedfollowing the same basic procedure. All require backingpatches or backup strips. These are simple laminatesthat are formed to the shape of the surface beingrepaired and bonded with epoxy cement to the back sideof the repair area. The backing patch serves twofunctions:1.It provides the foundation on which the exteriorsurface is built up and formed to match theoriginal contour.2.It provides the mechanical strength needed tokeep a repair structurally and visually intactduring normal operation and use.A repaired laminate must be as strong as the originalmaterial surrounding it. If it is not, the repair will not lastand is likely to crack around the edge of the patch.In addition to the backing patch, large fractures willrequire additional mat laminations which are used as afiller in building up the surface to the original contour.Perform the steps listed under Preparation Procedure(page 5), then proceed with the repair as follows:1.Using a tapered bit or a saber saw, remove thecracked and flaked fiber glass surrounding thedamaged area. For cracks, remove enoughmaterial so that there is an open gap at least 1/8inch wide (Figure 21). For small and largefractures, cut away as much material as isrequired to provide a solid edge (Figures 22 and23).WARNING - WEAR GOGGLES AND RESPIRATORWHEN CUTTING, GRINDING OR SANDING.CTS-4049Page 8
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