I agree with Prism 99, I would be very wary of your old can of spray. I tried to use an old one once and had nasty black stuff come out. I do it her way too, but I use a spray called 101 and it works great. Love using spray instead of pins. My fingers peel so badly that it's hard for me to use safety pins. I can use our big tables at school, and I have large clamps that I hold it all together with to be sure there are no wrinkles anywhere.