Hi, I know very little about construction so any advice would be appreciated. My plasterers have uncovered an rsj supporting the first floor internal wall and the rsj is showing surface rust with a couple of patches of deeper rust caused by condensation. I have given it a brush with a wire brush and will use a drill with a wire attachment .It's not flaking ect . Can I treat with with rust converter x2 and red oxide x2 or is it a bigger problem and need replacing? They plan to stick the plasterboard on with moisture resistant foam. I will address the condensation problem. Any advice appreciated.