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Did you paint the deck by hand, and did you hold the brush in that hand?
If so, it could be due to pressure on the nreve in the finger.
It's like a mild form of carpal-tunnel, only it's in the finger and not the wrist.
If it's from painting, physical therapy can help.
No, this is simple hand/finger exercises that help relieve stress in your hands and arms. Get a tennis ball, or a :stress ball (or even a balled up sock) and squeeze it in your hand repeatedly.
Heck, even just flexing your fingers will help.
I used to get shooting pains in my shoulder and neck before I fully realized what was causing it. Once my doctor informed me, I began a regular routine of stretching and hand clenching exercises at work, and I haven't had a pain in years.
I hope that this helps, because the other possibility would be nerve damage that might require surgery (as a last resort).
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