Most of the irons out today will handle both Monokote and Ultracoat. Every iron is a little bit different, even irons from the same manufacturer. The best thing is to learn your own iron and where to set it for each type of covering. Get a pocket thermometer to accurately set the temps on your iron. http://www3.towerhobbies.com/cgi-bin...LXB352&P=7  Also, learn how each type of covering is worked BEFORE you start actually covering a plane. Practice using is on scrap materails before you start working it on the plane.

Ken