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Simply so, do I need to prime before using Rustoleum?

Use a primer. Primer allows the paint to adhere better by providing a uniform surface, and will help it last longer. It can also seal a porous surface, block out stains from bleeding through the topcoat, prevent rust formation on iron and steel, and prevent tannin bleed on wood. For painted wood, no primer is needed.

Likewise, does rustoleum stop rust? Stop rust in its tracks with Rust-Oleum® Stops Rust® Rust Reformer. A layer of this flat-black coating bonds with rusty metal and instantly transforms it into a non-rusting surface. No need to sand down to bare metal, simply spray directly onto rust.

Likewise, do you need to sand before using Rustoleum?

Sanding is not required for most surfaces. We recommend sanding high gloss surfaces with medium grit sand paper. Slightly sanding any surface will promote adhesion and coverage.

Will painting over rust stop it?

The first step is to clean off loose rust and flaking paint and then apply a rust-inhibitive primer. You don't need to get down to bare, shiny metal—just clean off the flakes and powdery surface rust that prevent paint from adhering. Once done, you can paint over rust.