as with everything practice or the more you do the better you will become.one thing I have noticed is some irons do not generate enough heat.at one time when using coverite and a monokote iron there were instruction on how to turn the limiting screw of the thermostat to increase the heat for use with coverite.after doing that and then using the same iron on monokote at a slightly loere setting,just below the point of melting monokote adhesion and shrinkage were improved and wrinkles would not reappear as before.