Steel is durable, but in contact with moisture and oxygen it corrodes, in other words it rusts. For outdoor work such as steel roofs, structures, railings and garden gates, the surface protection system is the biggest factor in service life.

Hot-dip galvanising

Steel parts are dipped into molten zinc at around 450°C. The zinc bonds metallurgically with the steel surface and coats every inside and outside face. Even if the coating is scratched, the zinc continues to protect the steel.

  • Needs no maintenance outdoors for many years.
  • Protects the inside faces of box sections too.
  • Has a matt grey finish; paint can be applied on top if colour is needed.

Powder coating

After surface cleaning, powder paint is sprayed electrostatically and cured in an oven, giving a smooth, even and attractive finish in the RAL colour you want.

Liquid paint systems

Large structural members are blast cleaned, then primed and top-coated. Touch-ups can be done on site, but regular maintenance and repainting are needed.

The best result: a duplex system

For long life and good looks outdoors, the best solution is a duplex system: powder coating over galvanising. Galvanising provides the main corrosion protection, while the paint adds an extra barrier and the colour you want. We often recommend this system for louvre fences, garden gates and railings.

Maintenance tips

  • Check surfaces once a year and touch up any scratches or impact damage.
  • Check more often near the sea and in industrial areas.
  • Do not let water collect on roofs and in gutters.

We can help you choose the most suitable protection system for your project’s environment and use.

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