I've covered about 20 planes and could never master using Monokote. It seems you have to pull it too tight while stretching it possibly warping a wing or cracking some balsa. And I can never get all the puckers out of it.

I've never had that problem with the Ultracote and the results of using UC are always pleasing. Also, it seems you can pull the UC off a framework after sealing it down without harming the covering so there's alot less waste in the end.