I removed an SGP screen protector from an iPhone 5 I returned early this week and stuck it on the back plastic that I'd retained from the original SGP (dry) install. After I picked up the replacement phone on Wednesday, I did another dry install, making rule not to touch the back of the SGP. It took some fiddling, but I was able to remove the stray dust particles that were trapped beneath the film (probably mostly from sticking it on the original backing).