I was reading about Rustmort a bit more, and it says it turns the rust to Black and hardens so you can body fill or paint over it?
I would think you want it to turn white? also how does it affect the rest of the paint?
I have a nice original 81b that has some surface rust that I'd like to try it on, but don't want to ruin the original paint?
It works great on the white because it also has a bleaching effect. I has some spillage onto the red and it left streaks. I didn't notice, so it really started to soften the red paint and lifted a little..... Clearly operator error, not the product.