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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 converter-primer beats paint-over-rust
A direct-to-rust topcoat seals moisture in with the corrosion. It looks correct for a season, then the film blisters as the oxide underneath keeps expanding. Converting first breaks that cycle: the oxide is turned into a stable organometallic complex and locked under a polymer film before any colour goes on.
Because the converted layer is already a primer, you skip a step. Prep, convert, wait a day, topcoat.
What you can paint over RustGuard™
Once fully cured at 24 hours, the converted film accepts most conventional coatings.
| Topcoat | Compatible | Notes |
|---|---|---|
| Acrylic / latex enamel | Yes | Easiest pairing, low odour |
| Oil-based / alkyd enamel | Yes | Excellent for gates and railings |
| Chassis and underbody paint | Yes | Common choice on vehicle work |
| 2K epoxy or polyurethane | Yes, with a test patch | Always spot-test adhesion first |
| Cellulose / lacquer thinners | Not recommended | Aggressive solvents can lift the film |
| Powder coating | No | Needs bare, blasted metal |
Converter-to-topcoat timeline
- 01
Hour 0
Degreased, de-flaked surface. Brush on coat one.
- 02
Hour 0.5
Touch dry. The film starts turning from milky to dark.
- 03
Hour 4
Optional second coat on deep pitting or heavy rust.
- 04
Hour 24
Fully cured, uniform black-blue. Topcoat now.
- 05
Day 2+
Topcoat cured. Long-term protection is doing its job.
How much converter for your paint job?
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
Is RustGuard™ a finished paint?
No. It converts and primes. Leave it unpainted indoors or in dry shelter if you like, but anything in sun or rain wants a topcoat.
Can I paint over it the same day?
Wait the full 24 hours. Painting too early traps moisture from the water-based film and can cause the topcoat to blister.
What colour does it dry?
A matte blue-black. Uneven colour usually means uneven rust, not a failed application.
Do I need a separate primer as well?
No. That is the point of a converter-primer. Adding an extra primer coat is not harmful, just unnecessary.
Keep reading
- 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 paint over rust properlyPainting straight over rust always fails. Here's the correct sequence — prep, convert, cure, prime, topcoat — and the paints that work over a converted surface.
- 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.
- Rust converter spray, or a brush-on bottle you can control?Thinking about rust converter spray? Compare aerosol coverage, waste and control against the RustGuard™ brush-on bottle before you buy.
- How to choose the best rust converter for your projectSeven criteria that separate a good rust converter from a bad one — coverage, cure time, topcoat compatibility, and honest limits.
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Ships from our US fulfilment partner, typically 3–7 business days. 30-day money-back guarantee.