The lenses stick on glass by electrostatic force, without glue. For this reason, when they lose stickiness, they usually need to be cleaned from grease of dust on the rear side.
There are 2 lateral adhesive bands behind the film to help the adhesion on every surface. These adhesive bands have been engineered for multiple use (>100 of times) in proper conditions. These bands reduce their stickiness when they get dirty. In order to extend the optimal usability of the Blips lenses to very long time, we provide a spare adhesive tape within every Blips kit which allows up to 10 band replacements.