All screen protector pack comes with wet and dry wipes to apply before and after applying the screen protector. We will not be responsible if you damage your protector due to not applying it correctly on the display such as any air bubbles or dust stuck underneath the glass or if the protector does not stick due to not cleaning your screen properly. If in doubt best take to professionals. 

It's recommended not to use hard edged cases if you are going to use the 4/5D tempered glasses as it might push the screen due to edge nature of the phone. Please check the screen protector by laying on top of the screen along with your existing case before fixing it on the screen to check if the case does not effect the screen protector.

Its best to use soft Gel cases rather than hard Armor cases when you use this tempered glass due to edge nature of the phone.