I always had trouble getting fusible to stick evenly and consistently, until I started using a wet press cloth. When I'm using, fusible. I put a bowl of water next to the ironing board, completely soak the press cloth and wring it out. I lay it over the fusible, and press, with the iron on the highest setting. I usually use a scrap piece of an old sheet of a piece of muslin as a press cloth. That bit of steam as the water in the fabric evaporates gets in between all the fibers in the fusible and attaches it perfectly every time.