I am starting to believe it is because the mould has sharp 90 degree edges so the fabric cant get right into the edge. But the fabric has also held off on other areas, and the resin looks like it has been spread to thinly. I used some 3m 77 spray glue, but i only used a very fine mist to help it stick to the mould. I also worked the fabric the best I could into the edges whilst i was pulling a vacuum.