liquid steel

I met a new neighbor the other day who is building a dragster and is patching panels in his floor with liquid steel or J B Weld. Have any of you tried to patch floor pans using this instead of welding the patch panels in place?
I told him I would ask you guys what you thought. He doesn't have a welder or the knowledge to weld so is this a viable way to do this. I told him I have a friend who is going to weld mine when I get ready but he doesn't want to pay to have it done. He has a 67 Dart which looks really good. Don't know how it will run yet but sounds awesome.
So, lets here your answers.