I spray painted for a couple hours 3.5 weeks ago and my finger doesnt still doesnt have much feeling and i am still getting nerve sensation tingles. will this eventually go away? i thought by now, almost a month later, it would have gone away?

Nerve damage: Would be prudent to see your General Physician, Urgent Care, or preferably a specialist Neurologist, for an evaluation.

Repetitive activity: Constant flexion/ extension activity may well have irritated a nerve at your wrist or elbow. In order to fully assess, an EMG/ NCV study can pinpoint location and severity. Your doctor could order this, and following results, appropriate intervention could be obtained.