Over the past year, the cost of key ingredients for our EM121 Epoxy Mastic has skyrocketed—some by as much as 200%. Rather than compromise on quality, we set out to find a solution that delivers the same high performance you expect from Rustbuster.
After extensive testing, we launched Armaguard Epoxy Mastic last year, running it alongside EM121. Hundreds of litres sold, zero complaints—just the tough, surface-tolerant, high-build epoxy you need.
Now, as we move into 2025, Armaguard will officially replace EM121 in the coming weeks. Expect the same durability, flexibility, and colour range—just under a new name.
Epoxy Paint Black and now available in colours
Rustbuster Armaguard Epoxy Mastic is a high-build, high-solids two-pack epoxy coating (base and hardener) designed to renovate and protect rusting and pitted steel in severe environments.
It adheres exceptionally well to wire brush-cleaned steel, delivering the same outstanding performance as coatings applied over blast-cleaned surfaces. The finish is hard as iron yet flexible, moving with the steel.
Key Benefits:
✅ Tough & flexible – requires minimal prep
✅ Cold cure – effective down to -10°C
✅ Higher solids – more material left on the surface
✅ Faster overcoating – reduced wait times
✅ 3:1 mix ratio – more paint, less hardener
How Does It Work?
Rustbuster Armaguard Epoxy Mastic is a two-component epoxy formulated with nanoscale corrosion-protective pigments and short-chain molecules with low surface tension.
This unique composition allows the coating to flow into pits and troughs on the steel’s surface, creating a tough, penetrating primary bond for long-lasting protection.
This is one of the best bonds you can achieve with a paint finish. The high-build epoxy forms a strong protective barrier over the corrosion-inhibiting pigments that tightly adhere to the steel’s surface.
With excellent penetration and adhesion, this coating provides exceptional mechanical strength while creating a non-porous barrier between the elements and your precious metal.
Why Can’t Other Paints Do This?
Most rust-protection paints are single-pack coatings (without a hardener). These paints use standard-sized pigments bound in long-chain molecules, which have higher surface tension.
As a result, they tend to sit on top of the steel’s pits and troughs rather than flowing into them. The larger pigments also struggle to form a tight, protective matrix, leaving gaps that can allow rust to take hold.
