I don't think it's ever too late to start from scratch.
You may have to stay outside with him longer than 10-15 minutes at the time. What you want to do is give him many, many opportunites to be successful at "going" outside. When he does, have a party! Yummy, yummy treats and loads of excited praise.
If he sneaks off to pee in the house, you probably need to either use or crate or else tether him to your side (with a leash attached to your belt) when he can't watch his every move. When you do catch him going in the house, don't get angry. Just startle him into stopping with a loud "no" and rush him outside to finish. If he does finish outside, he's earned another party!
During this time of intense training, I probably wouldn't use the Belly Bands. I think they give him the idea that it's okay to pee inside.
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