One of the things an old timer taught me long ago is to know the temperatures needed to melt the adhesive, and the higher temperature needed to shrink the covering. A little time spent on getting those settings known on your iron will help you greatly. Lay a thin strip on your iron and if it curls, the iron is too hot for initial bonding. A lower setting allows you to get the edges perfectly bonded before you turn up the heat for the last shrinking process. I've tried about all the covering material out there but Monokote for me is the most consistent and easiest to use.