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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.
Aerosol versus brush-on, honestly
| Factor | Aerosol spray | RustGuard™ brush-on |
|---|---|---|
| Coverage per unit | Typically 10–15 sq ft | Approx. 55 sq ft per bottle |
| Overspray loss | Significant on open frames | None |
| Reaching pitting | Sits on high spots | Worked into pits with the brush |
| Masking needed | Extensive | Minimal |
| Wind sensitivity | High | Low |
| Cost per treated sq ft | Highest | Lowest at bundle pricing |
You can still spray RustGuard™
If you genuinely need a sprayed finish — large flat sheet, corrugated roofing, a repetitive production job — decant the brush-on liquid into a pump sprayer or an HVLP gun set for a thin water-based coating, and strain it first. You keep the bottle economics and get the spray pattern.
For frames, chassis and railings, though, a brush stays ahead. Bar stock and angle iron have edges that shed a sprayed film and hold a brushed one.
Getting a clean sprayed coat
If you do decant it, these five things decide whether the finish looks right.
- Strain the liquid through a paint filter so nothing blocks the nozzle
- Two light passes beat one wet pass — heavy film skins over and traps the reaction
- Keep 8–10 in / 20–25 cm from the surface and keep the gun moving
- Flush the sprayer with warm water immediately after; it is water-based and easy to clean while wet
- Work out of direct sun so the coat does not flash off before it reacts
Bottles needed for your area
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
Do you sell an aerosol can?
No. We sell the concentrated brush-on liquid because it covers roughly four times the area per dollar and reaches pitting that a spray film bridges over.
Can I use a garden pump sprayer?
Yes, for large flat surfaces. Strain the liquid, spray light passes, and flush the sprayer with warm water right after.
Will brushing leave brush marks?
The converted layer dries matte and slightly textured, and your topcoat covers it. Brush marks in the converter do not show through a finish coat.
How much do I need for a metal roof?
Use the calculator on this page. As a rough guide, a 20 × 30 ft roof section is about 600 sq ft, so plan on eleven bottles — the 8-pack plus a 3-pack.
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.
- Rust converter paint: convert and prime in the same coatRustGuard™ works as a rust converter and primer in one coat — convert corrosion, then topcoat after 24 hours. Bundles from $24.
- Rust converter for metal roofsTreat rusting corrugated roofing, gutters and flashing with RustGuard™. Coverage figures, safe access and topcoat guidance.
- 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 coverage calculatorWork out exactly how many bottles of RustGuard™ your job needs. Enter your area or pick a common job and get a bundle recommendation.
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Ships from our US fulfilment partner, typically 3–7 business days. 30-day money-back guarantee.