Do you have a heat gun? You'll find some spots where an iron doesn't shrink the film but the iron pressure stretches it instead. I find a heat gun works better. It spreads the heat over a wider area without pushing on the film. You have to be careful with a heat gun. Set it to medium-low heat. A bit too close or a bit too long in one spot and the film melts. It took some practice but I find a heat gun a better tool than an iron on some difficult to cover areas.