Make sure you take the time to clean your screen before applying.
With some light grazing in a room free of dust.
Wash your hands before.
'Cause every dust taken under the protection will be.
Finally, the most complicated moment is the installation, the glue under the protection must attirrer becaufe the dust cleaned and despite a nickel screen, after asking I have two or three visible dust. No doubt clinging to the glue before I ask protection.