Apply even pressure over the whole adhesion surface for at least 30 seconds to strengthen the bond.

For maximum bond strength on external-facing components (like displays and covers), you can leave the adhesive under pressure overnight.

Leaving the phone under a stack of books is a good way to do this—just make sure the books apply even pressure to the entire bond. You may need some kind of spacer to allow the books to lay flat.

Alternatively, you can use screen vice clamps around the perimeter of your device to set the new adhesive.