Just turn the household iron up slowly until you get to the right temp. where the glue on the covering is activated. Mark that spot on the temp control for next time. Check with your buddies at the field or where you fly if you need scraps of covering. Chances are they have lots left over and will give you what you need. Or just by a roll of white and get busy. Its fun once you get the hang of it. Trim it with a hobby knife blade, or any new sharp box cutter blade. You can do it. Good hunting.
Bill