This is any fun way to decorate for the holidays. I've tried this technique on my windows and the stencil has remained on the window even in below zero temperatures.
What you need
Tape snowflake stencil to your window. You can also use a spray adhesive to hold the stencil in place.
Add a good sized dollop of Stencil Paste to your stencil.
Slowly spread the Stencil Paste over the stencil. Gently push the paste into the stencil so that all of the corners are covered.
Remove the tape on the bottom and sides, leaving only tape at the top of the stencil. Slowly remove your stencil.
Let the Stencil Paste dry for 24 hours before applying glitter or paint.