Payments in this preview run in test mode — no real money is charged.

Worldwide tracked shipping · Free on 3+ bottles · 30-day guarantee

RustGuard™

Rust converter for cars — United Kingdom

Car rust rarely starts where you can see it. By the time a bubble appears in the paint on a sill or arch, the corrosion behind it has been working for a while. RustGuard™ lets you stop that spread on the areas you can reach — arches, sills, floor pans, subframes, boot floors — without stripping the shell to bare metal.

  • Brush-on formula
  • No heavy sanding
  • Paint-ready finish
Shop bundles

From $24 · free tracked shipping on 3+

Rust converter for cars — United Kingdom — RustGuard™ Rust Converter

RustGuard™ Rust Converter

  • Encrypted paymentCard details handled by Stripe
  • Tracked worldwideFree on 3+ bottle bundles
  • 30-day guaranteeMoney-back if it is not for you
  • Clear labellingCoverage and results stated honestly

Stock up & save

Choose your RustGuard™ bundle

Listed in USD and billed in USD; your bank converts to GBP at checkout.

Rusted steel grating covered in orange corrosion before treatment
Before
The same steel grating with a stable dark paint-ready coating after treatment
After treatment
One cast iron plate photographed half rusted and half treated with RustGuard™ Rust Converter
One part, one coat: the left half is untreated rust, the right half was brushed with RustGuard™.

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.

  • Wheel arch lips and inner arches where road salt collects
  • Sill and rocker panels below the door seal line
  • Floor pans and footwells, especially under old carpet underlay
  • Boot floor, spare wheel well and battery tray
  • Subframes, suspension turrets and rear beam
  • Bonnet and tailgate seams where water sits in the fold

Step-by-step on this job

  1. 01

    Get the car up and lit

    Ramps or axle stands on level ground, wheels chocked, and a bright inspection light. You cannot treat what you cannot see.

  2. 02

    Feather the paint edge

    Where rust has broken through, sand back until you reach sound paint with no lifting edge. Vacuum the dust out of the seams.

  3. 03

    Degrease hard

    Underbody film is oil, wax and road grime. Wash with detergent, rinse, and let it dry fully — trapped water stops the reaction.

  4. 04

    Brush the converter into the pitting

    Work along seams and inside lips with a small brush. Two thin coats on pitted areas beats one heavy coat.

  5. 05

    Cure 24 hours, then topcoat

    Chassis paint, underbody schutz or acrylic enamel all go over the cured film. Do not shortcut the cure — trapped moisture blisters the topcoat.

Rust converter for cars — treated metal surface
Illustrative image. Results vary with surface condition and preparation.

What not to do

The cautions that save a re-do.

  • Never apply near brake friction surfaces, discs, pads or wheel bearings
  • Mask fuel and brake lines, rubber bushes and electrical connectors
  • Keep it off glass, trim and good paint — wipe overspill immediately while wet
  • If a screwdriver goes through the panel, it needs welding, not converter

Typical quantities

A starting point based on the jobs customers order for most often.

JobBottles
Both rear arches1 bottle
Sills plus both arches2 bottles
Full underside of a hatchback3–5 bottles
Floor pans and boot floor2 bottles
Full 4x4 or van underside5–8 bottles

Work out your exact quantity

Rust condition

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 United Kingdom

  • Tracked delivery across England, Scotland, Wales and Northern Ireland, typically 5–10 business days.
  • Listed in USD and billed in USD; your bank converts to GBP 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

Will this pass a roadworthiness or MOT test?

Surface rust treated and painted is fine. Corrosion in a prescribed structural area, or metal you can perforate, is a failure regardless of what you coat it with.

Can I use it inside the cabin?

Yes, on the floor pan with carpet and underlay removed. Ventilate the car and let it cure fully before refitting trim.

Do I need to remove the wheels?

For arch work, yes — you want proper access to the inner lip, and it keeps product off the brakes.

What about seam sealer?

Convert first, cure, then apply seam sealer over the treated film and topcoat the lot.

Keep reading

Stock up & save

Choose your RustGuard™ bundle

Tracked delivery across England, Scotland, Wales and Northern Ireland, typically 5–10 business days. 30-day money-back guarantee.