Finishing small parts in volume

I have a small wooden shape about 3 1/2" by 8" that I sell during the christmas craft season and sell quite a few of them. My problem is the volume of finishing. They are made of pine and need a varnish applied. Does anyone have any ideas or methods I could beg, borrow or steal that won't result in runs or drips? Where talking about 500 pieces. Any help is greatly welcomed.
Dave
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