Can I put chicken marinade on chicken after it was almost cooked?
If it's the same marinade you marinated the chicken in, I would be very careful. If it's not cooked to a high enough temperature, it is not safe to eat, as it has been in contact with raw chicken. It would probably be safe, but I would just mix up a new similar batch and use that to finish off the chicken. It's not worth risking salmonella to save the cost of making a little more marinade.