Ezl is supplied with a special adhesive pad, which will stick to any FLAT (ie not curved). It will cope with most textured surfaces, because it’s very sticky!
It will NOT stick to silicone rubber phone cases. If in doubt, try a piece of sellotape or other sticky tape - if that sticks, so will Ezl.
You can remove Ezl at any time, by GENTLY working underneath it with a credit card or similar (don’t hurry, or be rough). If it has been on there a while, warming it with a hairdryer first will help soften the adhesive.
You can re-use the Ezl on another case, but until I can trial actual production mouldings (in late October), I can’t guarantee full re-adhesion power.
In a nutshell - it is a high quality special adhesive, designed to be as permanent and reliable as possible, WITHOUT damaging your phone or case.