My experience with the 3M adhesive spray is that it is messy, and isnt very good at what it is supposed to do. I have used just plain wood glue, and smeared it around with my fingers to the box in a pretty thin layer, and then applied the carpet and had wonderful results. However I also like to use contact cement but you have to make sure that you apply the cement to both sides, and let it DRY! Then apply the surfaces to each other. This method yeilds excellend results.later...