This is A photo of my Boeing F4B-2 done as the Army P-12. It's several years old and I fly it at IMAA events mostly. It sits out in the heat and sun for days on end and after the first time I just brought it home and hit it with the heat gun and the Tex has never needed to be shrunk up again. The covering is so easy to put on you can do A one piece covering around A curved fuse and then just shrink it down. Compound curves are no problem at all.
In my case on this plane I used the two colors then shot it with two thin coats of the water base urathane just to help with the clean up from the four stroke engine snot. Even if you go with gas it should still have the coating just to help the cleaning process and it helps keep the dirt out of the weave.
I have had the same luck with the Ultra Cote. I always cover then set it out in the sun on my deck all day during the sumer then tighten it back up and it goes forever without any sag.
Good stuff!!! Only thing the I find wrong with it is the price but that doesn't seem to hold me back from it!!