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- Tracked worldwideFree on 3+ bottle bundles
- 30-day guaranteeMoney-back if it is not for you
- Clear labellingCoverage and results stated honestly
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Listed in USD and billed in USD; your bank converts to CAD at checkout.
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.
Where rust shows up first
The areas worth checking before you order.
- Corrugated and trapezoidal steel sheeting
- Ridge caps, barge boards and flashing
- Gutters, downpipe brackets and valley trays
- Purlins and exposed steel framing in barns and workshops
- Fixing washers and screw heads showing rust bleed
- Roller shutter housings and canopy frames
Step-by-step on this job
- 01
Survey from below first
Daylight through a sheet, or a soft spot when you press it from inside, means replacement for that panel.
- 02
Clean the surface
Brush off moss, lichen and loose scale, wash down, and give it a full dry day.
- 03
Treat fixings and laps first
Screw heads and sheet overlaps are where rust starts. Do them before the open field of the sheet.
- 04
Apply with a roller or decanted sprayer
Large flat runs suit a roller on an extension pole. Work up the slope in manageable bays.
- 05
Topcoat with a roof-grade coating
After 24 hours, use a coating rated for roof exposure and thermal movement.
What not to do
The cautions that save a re-do.
- Roof work is a fall risk — use crawl boards, harnesses and a spotter, or hire a contractor
- Never walk on a sheet that has soft or perforated areas
- Do not apply if rain is forecast within a few hours
- Existing sheets that flex underfoot need replacing, not coating
Typical quantities
A starting point based on the jobs customers order for most often.
| Job | Bottles |
|---|---|
| Small shed roof, 100 sq ft | 2 bottles |
| Single-garage roof, 250 sq ft | 5 bottles |
| Barn section, 450 sq ft | 8 bottles |
| Gutters and flashing only | 1–2 bottles |
| Large barn, 900 sq ft | 8-pack plus 8-pack |
Work out your exact quantity
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.
Shipping to Canada
- Tracked delivery coast to coast, typically 5–12 business days.
- Listed in USD and billed in USD; your bank converts to CAD at checkout.
- Free tracked shipping on bundles of 3 bottles and above.
- 30-day money-back guarantee from the date of delivery.
Frequently asked questions
How do I measure roof area?
Length × slope width per pitch, then add both pitches. Add about 15% for corrugation profile — the metal surface is longer than the flat span.
Can I apply it in the sun?
Avoid hot metal. Early morning or a cloudy day keeps the film wet long enough to react properly.
What about rust bleeding from screw heads?
Treat the screw heads individually with a small brush. If a washer has failed, replace the fixing before you coat.
Will it stop existing leaks?
No. A converter is not a sealant. Fix the leak path, then treat the corrosion around it.
Keep reading
- Rust converter spray, or a brush-on bottle you can control? — CanadaThinking about rust converter spray? Compare aerosol coverage, waste and control against the RustGuard™ brush-on bottle before you buy.
- Rust converter for iron and steel that leaves a paint-ready surface — CanadaRustGuard™ rust converter reacts with existing rust and leaves a stable, primed surface you can paint. Bundles from $24 with worldwide shipping.
Stock up & save
Choose your RustGuard™ bundle
Tracked delivery coast to coast, typically 5–12 business days. 30-day money-back guarantee.