Your Vinyl decal is in three layers. The top layer is your application tape. Middle layer is your decal and the bottom is your backing paper.
Unroll the decal let it lay flat, face down for at least an hour before applying.
Use a little rubbing alcohol to clean the decal application area.
HINT: When applying to glass, DO NOT use Windex or other ammonia-based cleaners; the ammonia interferes with the adhesive.
Use masking tape to hold the decal in position.
Measure your decal and mark the center of your masking tape.
Check an even point on the decal and measure to check that both ends of the sticker are level.
Secure one side of the decal using masking tape. This will act as a hinge.
Then lift one side of the decal and pull it back 180 degrees.
Carefully begin removing the backing paper starting at the hinge. Pull back on itself 180 degrees.
HINT: Check to make sure the decal is sticking to the application tape. If not lay the backing paper back and try lifting it again. Squeegeeing can help. Try curling the paper back on itself.
Once the backing paper is removed. Do not let the decal touch the surface just yet. Hold it off slightly while you squeegee from the hinge end.
Squeegee the decal to make sure the decal seals to window and most of the air bubbles are removed.
Lightly squeegee from the center working your way outwards until you get to the other end. Then go over again using more pressure. Remove all masking tape and re-squeegee one last time.
Remove the application tape by starting in a corner and pulling back on itself (180 degrees). Do not rush. Make sure the vinyl is sticking properly and not lifting.
HINT: Any Air bubbles will usually disappear after a few weeks, if not, you use a pin to puncture the vinyl and squeeze the air by pushing down with your thumb.
HINT: Avoid wetting or washing the decal for 48 hours to allow the adhesive to bond.