I lay a sheet on the floor then lay out the bottom, batting and top. Peel back half of the top, spray the batting then smooth it back over and do the same for the other side of the top, flip it over or peel back the batting to expose the back and spray the batting and smooth it over again. If there are any wrinkles it's easy enough to peel back the fabrick and resmooth it. 505 is my new best friend.