I had this problem with my newly adopted rescue Panda. I ahve always had female dogs and was always raised with female dogs so Panda had been a learing experience for me. Like peeing and marking are 2 different things. I have had Panda for almost a month now. The 1st couple of days I caught him marking a couple things in the house. We haven't had anymore issues with marking inside though since then. He does mark all over outside.
We are still working on potty training. He has pee pee accidents about twice a week. Not to bad but I don't like dogs that are not potty trained.
I talked to a trainer at Petsmart and she told me the belly band should not be used as a training tool. All it does is keep them from soiling your belongs and furniture. She told me if I wanted to break him from marking and pottying in the house was to keep him on a leash at all times while in the house. That way if he goes to potty or mark I can catch him in the act. It's all about catching them in the act.
Let me tell you that is not easy. Panda is a high energy dog that has ADHD.
All I got to say is good luck!