i'm talking about some the arfs on the market now. they do not iron that covering on . they seal the seams and then they put them in a heating oven to shrink the covering and it does not adhere to a lot of the wood surface underneath. i have a couple of kit planes i built many years ago i covered in monokote. i used balsarite on the wood and the covering on them is still sealed and drum tight. a fella rc modeler i know is asian -american who has been to some of those manufactuers in china. he personaly watched the covering procedure in a a factory in china. he told me that they can cover one of those arfs in minutes. they do not seal the wood or draw the covering tight because it is cut from templetes. it looks great out the box until you start flying the model and the covering gets exposed to sunlight and fuel. here in florida in the high humidity and heat it wreks havoc with some these inexpensive arfs.