Treating Rust - Classic Car Restoration

FERTAN is a patented rust solution, which leaves a blackened surface on treated metal. Residue from use is neither acidic or a film of converted rust. All metal corrosion is simply converted to a detached inert dust.
FERTAN has proven over the last thirty years to be one of the best ways to eliminate rust from steel and iron surfaces. Applying FERTAN leaves surfaces rust-free for up to six months in preparation for final coating.

[@marcin1564]

Can I put an epoxy primer on fertan?

[@joellove6353]

muriatic acid too