Sony Xperia Z3 Compact D5803 Back Cover With Adhesive - Black

This back cover comes with adhesive and is pretty much a peel and stick type of arrangement.  Before you stick it down though, make sure that the surface that you’re sticking it to is very clean, and clean it down with isopropyl and ensure that it is dry before peeling the backing from the adhesive and placing it on the device.

Just make sure you don’t touch the adhesive with your fingers and use heat to activate the adhesive.  If the back has to be taken off for some reason after it's been stuck on, you will need to apply fresh adhesive.