Using a straight edge and a soldering iron to melt a cut line into the film coating.
Pealing the protective film away is now a snap.
Builder Tip:Don’t drag the point (tip) of the soldering iron down the skin ... you will put a scratch in the aluminum. It is better to use a cone shaped tip and drag the side of the cone down the plastic coating or if you have spare tips, just round off the tip altogether.
Skin with plastic coating removed from rivet lines.