How can I smoothly sugar the rim? Sometimes I end up with a nice even coating of sugar on my lemon drop's rim (it's served in a martini glass). But most of the time the sugar is clumpy and uneven. What can I do to encourage a nice smooth professional coating of sugar on my glass rim?
The clumps come from too much liquid on the glass when applying the sugar.

The way I learned to salt a glass was to dip the glass upside-down in a shallow plate or bowl of water, let it drip for 5-10 seconds, then dip it into an evenly layered plate of salt.  I think this should work for sugaring a glass.