These Glue-up ceiling tiles really must have the proper adhesive. We used a glue that was okay at first but as it turned out, it is not advisable to use when it is hot, and it was very hot that day. There was a bit of shrinking in a few spots due to our mistake. I finally used vinyl wallpaper paste to secure them. That worked very well. The tiles are pretty! Just be careful, and follow the directions, and they should be just fine.