Ultracote, because it doesn't sag.

During my 13 month house remodel, all of my models sat in a steel container in my driveway, in the hot California sun... when I took them out, every Ultracote covered model was still drum-tight on the covering, whereas the Monokote covered model looked like a prune.

I'm sure there are ways to prevent Monokote covering from sagging too.. but why bother figuring out how, when you get that benefit automatically with Ultracote ?

Gordon