I have the model tech Dragon Lady and she flys real nice. The covering is ultracote and I have not had a problem with it. Our weather here in Tenn. gets pretty hot (90+) and the covering is holding up nicely. Won't ever recover a plane till the covering goes bad so it still has original on it and is over a year old. Was disappointed that the advertisement said the plane was a 60 size though, and she performs best with a 120 magnum in her. Had a vmar edge 540 and destroyed it. The plane is made of wood something like balsa but must be some local cotton wood and bamboo. The plane was too heavy and the cg was too hard to find. My vote is on vmar products.