Monokote application
Did you know that you can stretch Monokote three times farther than it shrinks? That's the key to a smooth Monokote job that will hold up.
Monokote always wants to return to its natural state, that is, how it was on the roll. If you drape it on the frame like a blanket, iron down the corners, then shrink it, it will relax over time. On the other hand, if you heat and stretch the Monokote as you apply it, it will attempt to shrink back to its original size over time. As long as the covering is well-anchored to the airframe, it can't shrink, and won't wrinkle.
To do it properly, you need to have plenty of overlap around the edges to grab and tug on. When the instructions say leave an extra inch around the edges, they mean it. Don't be afraid to put some muscle behind the tug. As long as you start by anchoring the Monokote to something solid on the airframe, you won't hurt a thing.