Steel Types & Finishes for Outdoor Art & Signage NZ

LisaSarah uses only premium quality New Zealand steel, selected for durability, longevity and performance in outdoor conditions.

Unlike cheaper alternatives such as acrylic (perspex) or aluminium composite (ACM), these materials are designed to withstand New Zealand’s harsh UV exposure and changing environments — ensuring your artwork or signage lasts for years to come.

Steel Options We Offer

• Powdercoated stainless steel (matte black, white, gold and limited edition or custom colours)
• Corten steel (3mm)
• Marine grade brushed stainless steel (316) — ideal for coastal environments
• Aluminium (3mm) for larger, lightweight pieces

Powdercoated Stainless Steel (Black, White, Gold & Colours)

Lisa uses high-grade 304 stainless steel as the base for all powdercoated finishes. This is the same grade used in high-end appliances and offers significantly greater corrosion resistance than mild or galvanised steel.

Each piece is coated in a durable, UV-resistant architectural finish designed for long-term outdoor use.

Like windows or exterior fixtures, occasional rinsing with clean water helps remove environmental residue or salt deposits and maintains the finish over time.

For homes in high coastal zones, upgrading to 316 marine grade stainless steel beneath the coating is recommended for additional protection.

Corten Steel (Weathering Steel)

Lisa uses 3mm New Zealand corten steel, an architectural material designed to develop a natural, protective rusted patina over time.

While corten has a rusted appearance, it is highly corrosion-resistant. The outer patina forms a protective layer that prevents further deterioration, making it ideal for outdoor art and signage.

As the steel weathers:

• The patina develops gradually with exposure to moisture and air
• Some rust runoff may occur during the early stages
• This is normal and part of the natural weathering process

The finish can be maintained or sealed at any stage using products such as Penetrol, depending on your preferred look.

Marine Grade (316) Brushed Stainless Steel

For coastal environments, Lisa uses 316 marine grade stainless steel, known for its superior resistance to corrosion.

This material is widely used in marine applications and performs exceptionally well in high-salt environments.

To maintain its appearance:

• Wash regularly with fresh water and mild detergent
• Rinse thoroughly and dry with a soft cloth
• Always clean in the direction of the grain

Over time, stainless steel may develop tea staining — a cosmetic discolouration that does not affect structural integrity and can be managed with regular cleaning.

Aluminium (Lightweight Option)

While most pieces are created using steel, 3mm aluminium is sometimes used for larger designs where a lighter weight is beneficial.

Aluminium is durable, corrosion-resistant and suitable for powdercoated finishes, making it a practical option for oversized pieces.

Designed for New Zealand Conditions

Every material used is carefully selected to perform in New Zealand’s unique climate — from strong UV exposure to coastal conditions.

These are not temporary or decorative materials. Each piece is designed to last, with the strength and integrity expected of architectural steel.