I spray baste everything. I love my spray. I have only pinned very small projects and I hated those darn pins while quilting - I would never use pins on anything bigger than table topper size. I do it on my basement floor, and I open the basement windows - there is a great cross wind through my basement, and when there isn't, I have a large fan down there to blow towards the window. I have never had a problem with wrinkles in my backing, nor have I had any puckers. I never have problems with over spray either. I usually use 505, but recently tried June Taylors and have found it to be comparable, though a bit smellier.