If you have a stubborn air bubble, you can gently lift the edge of the InvisibleShield closest to the bubble and use the squeegee to re-apply that area of the screen protector. Stubborn bubbles may require more than one attempt to remove. Again, lift up the edge closest to the bubble. Using the squeegee, push the remaining portion of the air bubble to the lifted edge of the glass. For additional installation tips and instruction, please watch the installation video below.