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Prices in USD. Free tracked shipping on 3-bottle bundles and above.
Rusted metal in, paint-ready surface out
Brush RustGuard™ over sound rust, let it cure, then paint. Images are illustrative — results depend on surface condition and preparation.
Why paint over rust fails
Rust is porous and holds moisture. Cover it with paint and you seal that moisture in against the steel, with oxygen already present in the rust layer itself. Corrosion continues, the oxide expands, and the paint film loses adhesion from below.
The flaking you see a few months later is not a paint quality problem. The paint did its job on the surface it was given; the surface was the problem.
The sequence that works is: remove loose material, stabilise what remains chemically, let it cure, then paint. A converter turns the rust into an inert dark film that paint can grip.
The correct sequence
- 01
Remove loose rust and lifting paint
Scrape and wire brush. Feather the edges of sound paint so there is no lip to telegraph through the finish.
- 02
Degrease and dry
Wash, rinse, dry. This step is skipped more often than any other and causes more failures than any other.
- 03
Convert the remaining rust
One thin coat, two on deep pitting. Wait for the colour to darken.
- 04
Cure 24 hours
Non-negotiable. Painting over an uncured film is how you get blistering weeks later.
- 05
Prime only if your topcoat needs it
The converted film acts as a primer for most systems. Check your paint's data sheet.
- 06
Topcoat within about a week
Two thin coats beat one thick coat, and give a far better edge on corners and seams.
Paints that go over a converted surface
| Topcoat | Suits | Notes |
|---|---|---|
| Alkyd / oil-based enamel | Gates, railings, machinery | Traditional, tough gloss finish |
| Acrylic water-based metal paint | Indoor steel, light exterior | Low odour, fast drying |
| Chassis / underbody coating | Vehicle frames and undersides | Excellent chip resistance |
| 2K epoxy or urethane | Industrial and marine | Best durability; follow the data sheet |
| High-heat stove paint | Stoves, flue surrounds | Required wherever heat exceeds enamel ratings |
Plan your coverage
Area
100 sq ft
Bottles needed
3
Recommended bundle
×3 — $42
Based on up to 55 sq ft per bottle on smooth steel, adjusted for surface condition. Estimates only — measure generously.
Frequently asked questions
Can I use a rust-inhibiting paint instead?
Direct-to-rust paints are convenient on light surface rust. On pitted or scaled rust, converting first and then painting is much more reliable.
Do I still need a primer?
Usually not — the cured converter functions as your primer. Check what your specific topcoat expects.
How long can I leave it before painting?
Topcoat within about a week. Beyond that, wipe the surface down and check nothing has re-rusted at the edges.
Can I spray the topcoat?
Yes. The converted film accepts brush, roller and spray application equally well.
Keep reading
- How to use rust converter, step by stepThe full method for applying a rust converter: preparation, degreasing, coats, cure time and topcoating. Written for RustGuard™ but valid for any converter.
- Rust converter primer, in one coatRustGuard™ converts rust and leaves a paint-ready primed film in a single coat. No separate primer, no blasting. Bundles from $24 with worldwide shipping.
- Rust converter for iron and steel that leaves a paint-ready surfaceRustGuard™ rust converter reacts with existing rust and leaves a stable, primed surface you can paint. Bundles from $24 with worldwide shipping.
- How to remove rust from metalAbrasives, acids, electrolysis, chelation and conversion — what each rust removal method costs in time and effort, and when each one is the right call.
- Rust converter drying and cure timeColour change, touch dry, recoat and topcoat windows for rust converter — plus how temperature and humidity change every one of them.
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Ships from our US fulfilment partner, typically 3–7 business days. 30-day money-back guarantee.