I have used the spray often and it does last months with on problems. you do have to smooth it a little from being rolled up.
Sometimes it gums the needle but I think I spray to heavly. You must use a light hand and spray evenly. I taped my down on the hard floor, if your knees and back can take it. Or you just have to use a billion quilting pins.
On longarms ,I thought it smoothed out on its own.