REPAIR INSTRUCTIONS USING FIBER GLASS MATERIALFigure 35. - Sanding Backing Patch16.Now determine a method of holding the backingpatch in place (C-clamps, self-tapping screws,etc.) and trial test the method (Figure 36).NOTE-If you use self-tapping screws, predrillthe holes. Then before finishing the surface,remove the screws and fill the holes withbody filler.Figure 36. - Attaching Backing Plate17.Mix epoxy adhesive according to theinstructions.18.Apply the adhesive to underside of the repairarea and also to the patch (Figure 37). Presspatch in place until epoxy squeezes out from alledges.19.Hold backing patch’ with clamps or screws andallow the adhesive to harden for the time given inthe manufacturer’s instructions (Figure 38).NOTE-If the adhesive Is squeezed into thetapered groove or hole during bonding, cleanit out before the adhesive sets, and roughenany remaining adhesive with 360 gritsandpaper after It hardens.Steps 20 through 23 apply for large fractures only. Forcracks or small fractures, omit Steps 20 through 23 andgo on to Step 24.Figure 37. - Applying Epoxy AdhesiveFigure 38. - Cleaning Excess Adhesive From DamagedArea20.While the adhesive is hardening, cut somepieces of mat to fit into the hole in the panel(Figure 39). The mat is not a structuralreinforcement, but a filler.NOTE-Cut enough pieces of mat which whenlayered will fill the hole to Just below thesurface of the original panel.Figure 39. - Cutting Mat For FillerCTS-4049Page 12
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