Rustbuster Bor-X Anti-Flash Rust Inhibitor 20L

Stop flash rust on freshly cleaned steel

Rustbuster Bor-X is a water-soluble corrosion inhibitor that stops flash rust — the sudden orange corrosion that appears on bare steel within minutes of blasting, washing or cleaning. Add it to your wash, rinse or cleaning water and your freshly prepped steel stays clean and rust-free until it is dry and ready to paint.

Ideal for:

• Classic car & vehicle restoration
• Prepping steel for paint or coating
• Small workshops & fabrication shops
• Protecting parts during handling & storage between stages

It is simple to use with no special equipment: clean the metal of oils and salts, mix Bor-X into your water at a low rate (typically 0.25–2.0%), treat the surface and let it dry. Test on a small part first to dial in the concentration. Read our guide: how to stop flash rust with Bor-X →

Also a multi-metal inhibitor for metalworking fluids

Bor-X is equally at home in industry. It is a high-performance, water-soluble, multi-metal corrosion inhibitor that integrates easily into semi-synthetic and fully synthetic metalworking fluid systems, giving reliable short-term protection on ferrous materials during machining, handling and interim storage between process stages.

Key benefits:

• Prevents flash rusting and staining on ferrous metals
• Suitable for multi-metal machining environments
• Easily incorporated into semi-synthetic & fully synthetic formulations
• Flexible treat rates to balance performance vs cost
• Supports clean machining and improved surface appearance

Typical applications: semi-synthetic & fully synthetic metalworking fluids; machining, grinding and cutting operations; short-term corrosion protection during manufacture and handling.

Typical treat rate: 0.25–2.0%, set by your formulation, operating conditions and required corrosion performance. Higher rates improve resistance to flash rusting, particularly in humid environments.

Supplied as a 20L concentrate

Bor-X is currently available in a 20L pack. Because it works at such a low dose (0.25–2.0%), a single drum treats a large volume of water or fluid and goes a very long way — excellent value for busy restorers and workshops.