A Checklist to Help You Troubleshoot Your Sticky Issues.
1. Was the surface clean?
Ideally, the surface must be clean, dry, and dust and oil free.
2. Was it the surface texture?
Try testing the sticker pads on a flat, clean surface (metal or glass always works well), and see if your pads adheres well there.
3. Was it installed properly?
As the name "pressure sensitive adhesive" implies, there needs to be an application pressure across the entire width to get the contact needed for a good bond.
4. Could it be you? Are your hands clean, or could you be inadvertently causing the contamination?
For example, if you recently worked on a car engine or used hand cream, you could be adversely affecting the surface.