Thank you all for the help! My iron also has a temperature regulator (with L/M/H areas, like the one that Caroline has), and after testing the covering in other pieces, I think I know approximately the temperatures. When it's between Low and Medium, the Oracover starts to get sticked to the piece, and if I increase the temperature, it starts to shrink. At maximum temperature, the colour changes for a few seconds and it gets really tight. I think I'm ready to start covering the plane. Also, I finished al the pieces, should I cover the ailerons (and the elevator and rudder) before I install them?