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Figure 5-12 Shape and smooth the fillet with a Figure 5-13 Clean up remaining excess epoxy out- rounded tool. side of the clean margin before it cures. 3. Cleanuptheremainingexcessmaterialoutsideofthemarginbyusingasharpenedmixing stick or a putty knife (Figure 5-13). Fiberglass cloth or tape may be applied over the fillet area before the fillet has cured (or after the fillet is cured and sanded). 4. Sand smooth with 80-grit sandpaper after the fillet has fully cured. Wipe the surface clean of any dust and apply several coats of resin/hardener over the entire fillet area before final finishing. 5.4.4 Fairing Fairing refers to the filling and shaping of low areas so they blend with the surrounding sur- faces and appear “fair” to the eye and touch. After major structural assembly has been com- pleted, final fairing can be easily accomplished with WEST SYSTEM epoxy and 407 or 410 low-density fillers. 1. Prepare the surface as you would for bonding (Section 5.4.1). Sand smooth any bumps or ridges on the surface and remove all dust from the area to be faired. 2. Wet out porous surfaces with unthickened epoxy (Figure 5-14). Figure 5-14 Wet out porous surfaces before applying Figure 5-15 Trowel the thickened epoxy fairing com- thickened fairing compound. pound into the voids and depressions with a plastic spreader. 3. Mixresin/hardenerand407Low-Densityor410MicrolightTMfillertoapeanutbuttercon- sistency. 4. Trowel on the thickened epoxy mixture with a plastic spreader, working it into all voids and depressions. Smooth the mixture to the desired shape, leaving the mixture slightly higher than the surrounding area (Figure 5-15). Remove any excess thickened epoxy before it cures. If the voids you are filling are over 1⁄2" deep, apply the mixture in several applica- tions or use 206 Slow Hardener or 209 Extra Slow Hardener, depending on ambient temperature. 5. Allow the final thickened epoxy application to cure thoroughly. Using WEST SYSTEM® Epoxy 42 5PDF Image | Vacuum Bagging Techniques 002150
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