Rinse and dry the wings and place them in a slow cooker with 1/2 the jar of sauce. Cook on low for 4 hours.
Preheat oven to 350ºF.
Place the wings on a baking sheet and bake for 10 minutes to get skins crusty.
Brush the wings with sauce on one side and return to the oven for 10 minutes. Flip wings over and brush with sauce on the other side. Return to oven again for 10 minutes. Repeat until sauce is as thick and sticky as you would like.