Gloves will prevent the small muscles in your hand from getting stronger and fully developing. If your hands are sweaty and the bar is slipping, use chalk or liquid chalk if your gym does not allow chalk usage.
If you have tendonitis, look into a good warming muscle cream like rubA535 to apply to your wrists before your workout.
The problem with wrist wraps and things like that is they weaken the wrists because they don't allow the small muscles in the hands and wrists to get stronger. You end up worse off in the long run by using them.