With 70's Holdens, I reckon that going back to bare metal really justifies a rustproofing undercoat before the primer.
I recommend the Rust Bullet, its different than anything else as far as I can see. I used it, great results, I havent used the KBS, but if you look at the Rust Bullet comparison test its pretty convincing.
I am gonna put a Rust Bullet thread up soon, would have been this week, but I have found that I have lost some of my before and after pics, I cant find pics that show all of what I was going to talk about, I'll try and get some sort of thread up tonight,
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