Mike, I don't need to reshrink my planes from year to year with the Ultra. I have always lived in either Calif. or NV so it may not get hot enough in other states to do this. After I cover the plane I set it out in the hot sun and let it do the nasty ugly then bring it back inside to cool off. Then I reshrink it and do the sun thing again. It takes a time or two doing this but I end up with a covering job that stays tight, even when I went to shows for days on end with my planes out in the hot sun. This trick works even better with the Solartex covering. I just call this curing the covering.