how to paint spindles on chairs

Can someone please tell me how to paint a chair that has spindles? When I paint the seat part I get paint on the lower part of the spindle. I try to remove it while I am painting but it just becomes a mess. I do not have a paint gun so I am using a brush and a sponge brush. Is there anyway to avoid getting the paint on the spindles as I am going to be painting them a different color. I will appreciate any advise that I can get.
Thank you
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