Ok I started grinding and now help

Another thing to consider is that rust conversion coatings use phosphoric acid, and only convert the top of the layer of rust, essentially encapsulating the active rust under a layer of neutralized, converted and captured rust. Products like EvapoRust (when used properly) will get rid of the rust, as well as making an electrolysis unit, but short of doing that, you're just prolonging the inevitable, which is more rust removal. It's a noble task, trying to save your car from rust, but if you can't eliminate it, you're basically just wasting your time, and most certainly your money.