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Figure 5-21 Remove the topmost trimming. Then lift the opposite cut edge to remove the overlapped trim- ming. Wet method Figure 5-22 Apply the first coat of unthickened ep- oxy to fill the weave of the cloth before the wet-out coat reaches its final cure phase. An alternative is to apply the fabric or tape to a surface coated with wet epoxy. As men- tioned, this is not the preferred method, especially with large pieces of cloth, because of the difficulty removing wrinkles or adjusting the position of the cloth as it is being wet out. However, you may come across situations when this method may be useful or necessary. 1. Prepare the surface (Section 5.4.1). 2. Pre-fitandtrimtheclothtosize.Rolltheclothneatlysothatitmaybeconvenientlyrolled back into position later. 3. Roll a heavy coat of epoxy on the surface. 4. Unroll the glass cloth over the wet epoxy and position it. Surface tension will hold most cloth in position. If you are applying the cloth vertically or overhead, you may want to wait until the epoxy becomes tacky. Work out wrinkles by lifting the edge of the cloth and smoothing from the center with your gloved hand or a spreader. 5. Apply a second coat of epoxy with a foam roller. Apply enough epoxy to thoroughly wet out the cloth. 6. Removetheexcessepoxywithaspreader,usinglongoverlappingstrokes.Theclothshould appear consistently transparent with a smooth cloth texture. 7. Follow steps 7, 8 and 9 under the dry method to finish the procedure. Any remaining irregularities or transitions between cloth and substrate can be faired by us- ing an epoxy/filler fairing compound if the surface is to be painted. Any additional fairing done after the final coating should receive several additional coats over the faired area. Note: A third alternative, a variation of both methods, is to apply the fabric after a wet out coat has reached an initial cure. Follow the first three steps of the Wet Method, but wait un- til the epoxy cures dry to the touch before positioning the fabric and continuing with Step 3 of the Dry Method. Apply the fabric before the first coat reaches its final cure phase. 5.5 Epoxy barrier coating The object of final coating is to build up an epoxy coating that provides an effective mois- ture barrier and a smooth base for final finishing. Apply a minimum of two coats of WEST SYSTEM epoxy for an effective moisture barrier. Apply three coats if sanding is to be done. Moisture protection will increase with additional coats, up to six coats or about a 20 mil thickness. Additives or pigments should not be added to the first coat. Mixing thinners with WEST SYSTEM epoxy is not recommended. Disposable, thin urethane foam rollers, such as WEST SYSTEM 800 Roller Covers, allow you greater control over film thickness, are less likely to cause the epoxy to exotherm and leave Using WEST SYSTEM® Epoxy 45 5PDF Image | Vacuum Bagging Techniques 002150
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