It depends on the product you used. Some are only intended to e used a temporary bond till sewn, others are intended to be a permanent bond and no sewing required. Some permanent fusibles you can not sew through.... so read your package instructions. When in doubt make a small sample wash it and dry it a few times. Its been my experience the dryer is the real test as it heats to fusible to the "melting point" , and appliques can start to peel and shift.