I do the same, except with one tack coat, one medium, one heavy. I'd rather sand out one or two runs than a whole car full of orange peel. But the thing is, in my case I can see a big difference in fresh UC35 and after it shrinks. The UFC seems to look great even if I wait a few months to buff. Here's a shot of my Mustang, about a year after I painted it, but a few weeks before I buffed it. They didn't look that good in UC35, even though it was a week old, prior to wet-sanding and reclearing.