Hello Bill:
 
I only have about 30 hives so don't need as many patties as some
beekeepers but I use a portable electric drill with one of the paint
mixing devices.  Takes a little time but keeps you out of the mix.
 
I plan to rip off a new batch today adding wintergreen as has been
mentioned on the list lately.
 
Jim Shoemaker
Brookline, MO USA (near Springfield and Bass Pro Shop)