Put the first screen protector on perfectly, not a single air bubble. After 3 days I began to notice a few small bubbles right in the middle of the screen, never seen this happen on screen protectors after they have been applied. Also whilst phone is on standby, you can see odd effect. I can only describe this effect as similar to when you mix oil with water. It's extremely hard to describe, so I tried to video it for a video review, unfortunately the camera can't quite capture the problem with footage.