Can't remember the name exactly, it was something cheesy like 'No More Rust !' or something
I was repairing a rust hole below the mirror, so it was sanded down and some body filler put over the top. The filler stuck to it really well though, didn't have any problems.
If I remember the name I'll post it up, but it was just some cheap stuff from Halfrauds that I thought I would try to see if it really worked.