My method is: one layer on the rim. While that dries, one or two layers on the tire (one layer if the basetape is latex impregnated, two if not), then one wet layer on the rim and immediately mount. It's worked really well except for the one caveat below.
A word of warning about tire/rim compatibility. If the rim has accommodation for a seam, use only seamed tires on it. My carbon rims have accommodation for a seam. I mounted a tufo to it and it rolled during a race (nasty crash) because the centerline of the tire was not attached to the rim. The other way around works, but as others have pointed out, a seamed tire will not fit well on a non-seamed rim. It won't roll but it will be lumpy.
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Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter