I have used all sorts of "natural" crystal deodorants:
rock
spray
roll-on
Out of those 3, I definitely liked the roll-on the best b/c I felt like I was finally getting a decent layer of coverage, but you do need to let it dry before putting on your top.
That said, I do not have a problem with wetness - as a matter fact, I rarely sweat & when I do it is the lightest dew layer ever. The problem I contend with is odor, which I suspect has to do with not ever really sweating (like the stagnant pool effect).
For me, using those perfumer rollers has hands down been one of the best ways that I've controlled odor. With Secret deodorant, if I got hot and ended up sweating (albeit a fractional amount), I would kick up a serious funk! Ironically, Ban roll-on (unscented) has been one of the best commercial deodorant, a/p's out there to control odor and if it gets on a black top I'm wearing, one swipe of my hand and the white easily comes off of the fabric.
This is no doubt more than you wanted to know...
So one last thing, I definitely intend to try out the LUSH line of deodorants (aromacreme, if nothing else). I will post back and state what I think of it, but that won't be for quite some time.