How to best apply the label?
The labels adhere best to flat, smooth and grease-free surfaces. Be sure to thoroughly clean the surface to which you want to affix the sticker before use.
For cleaning we recommend the use of alcohol-free glass cleaners. These remove grease very effectively and usually dry quickly so that nothing stands in the way of a firmly adhering sticker.
If you prefer the use of other cleaners, you should first test on an inconspicuous place whether the cleaner leaves your surface undamaged. This is especially true for solvents containing acetone or nail polish removers.
To avoid misunderstandings or problems when reading the QR Code, you should also pay attention to where you attach the labels. Avoid placing them next to other QR Codes or barcodes. For more information, please refer to the existing question: Where do I best put my sticker?.