Let the repair resin dry fully underneath the clear film. You can let it set as long as you want, there's no time limit. The last thing you want is to pull it off while it's still wet. Ten minutes should be plenty of time. Don't start cussing if you pull it off too soon. All you need to do is add a new drop of resin and re-apply a new piece of film.
Clean up your repair by scraping the excess resin from the windshield with the razor blade. Now step back and admire your work. You know you've done a good job when you can't even find the old chip in the windshield.
If the repair isn't perfect, all you need to do is repeat the process until it's smooth and perfect.
