Mine stuck like glue once it was in place, I just peeled the backing, I sprayed it with windex, and put it in place with masking tape. I then carefully squeegied (sp?) out the bubles. This took some time, but the finished project was great. I think it looks as good as paint, maybe better, and was no where near the work. I am not sure if you can re-try it, it would depend on why it came un-stuck to begin with. If you bought it at an LFS they may give you a new piece if you explain your problems. If you used soap and water, you might try re-wetting with water only, and re-applying. the soap may have left a residue which kept it from adhereing. I'm really guessing here though.