You mentioned they are ARFs. Sorry if I am stating the obvious, but are you sure they are actually Monokote and not some other brand? Either way, you need to go over the entire plane with a hot iron to reseal everything. I just purchased a Great Planes Big Stik ARF that is covered with Monokote, and just removing the masking tape that kept some of the pieces together in the packaging made the covering lift. I had to go over the entire plane with a hot iron to ensure it is fully secure.