How to afix shower rail to tiles?
You shouldn't need to have any additional adhesive on the rod or wall for it to stay up properly. You can try to clean the wall and rod thoroughly to see if that helps. You can also try to tighten it (making it longer). If you find that you have to tighten it to the point where the rod itself it starting to bow, or it is pushing out the wall, then it it way too tight. If you have to excessively tighten it, then that would indicate that the rod has worn out and should be replaced.