Why there are so many bubbles?

Too less water. Please tear it down and spray a lot of water, then apply window film again.

Why film cant stick well and fall down?

Have not removed the transparent backing film. Please dont forget to remove the backing film or it will not cling.

If you have removed the backing film, you may apply the wrong side. Please apply the smooth side to the window.

Why the edge of window film curling up?

The edge of film is too close to the window. Please leave a small gap(about 1 cm )to press out water and air bubbles so that the window film can stick well.

How to remove and store the window film when it is not needed?

Please peel it off at the corner and then keep it in a roll, can be reuse multiple times just wet it again.