Notice the curved path that the fibers take around the gash in this Cabrinha leading edge. This rip was not spread open when this patch was first laid down. Even though there was adhesive patch cloth on both the inside and the outside, the persistence of air pressure without sewing continues to work on the weakness—creeping the adhesive little by little. Eventually it will fail dramatically losing the bladder in the process. Below is a shot after we redid this repair. Internally there are two layers which you can see have a larger perimeter than the external cosmetic layer.
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