I have used many sprays, but just bought a case of the 505 online (it was half price with no shipping) at Sewforless.com and boy is it great. It does not smell and you have to use so much less than the others. I spray the top, then the bottom, then turn over and smooth out the top again. I only pin in the four corners so they don't shift when I am putting on the binding. I do wash my quilts when they are finished. Not only to get out the spray, but to get the "crinkle" look I like...it tends to hide the imperfections in the quilting too.