I use the floor. I put down an old shower curtain to protect the floor/carpet. I lay the backing down and smooth it out. I spray a little in the middle and a little bit on the backing, then I lay the batting down. I fold back about half of the batting and spray it, press down and smooth. Do the other half. Flip the batting/backing over and smooth again. If you work quickly you can get any wrinkles out. Flip back over and lay down the topping. Fold back half the top and spray the batting, then smooth. Do the same again for the other half. Smooth again and you're done. I love the 505 bit I'll use the stuff in the light blue can, too.