i have a sig somethin extra i bought when they first came out. i still have it and the covering is stll good on it. it is covered with oracover. oracover was a excellent covering because i used it myself. ultrakote and oracover are supposed to be the same but there has always argument about that. i did a repair on my extra and used purple ultrakote and it matched the oracover. one of my flying buddies use's that sig aerokote for his ep planes. he says it great for ep planes but i don't know about glow planes. sometimes i think its not the covering itself but how the arf manufacturers put it on.