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Cut out a patch large enough to overlap the damaged area by a minimum of 38 mm (1.5 in.) from all sides. Center the patch over the damaged area and with a pencil trace the outline of the patchApply masking tape around the perimeter of the outlined patch area to ensure a tight and clean glue line Using 100 grit sandpaper or a pumice stone, roughen the patch area on the boat as well as the backside of the patch. When sanding, you just need to rub off the protective outer surface of the fabric unti