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Every summer I get a version of the same email, usually from someone building or renovating near the water: "I love this piece - but will it actually survive where we are?"
It's exactly the right question to ask. The New Zealand coast is beautiful and it is hard on metal. Salt-laden air gets into everything, finds every weak point, and quietly works away at it. In 19 years of making steel and aluminium pieces for New Zealand homes - more than 50,000 of them, plenty headed to coastal addresses from the Coromandel to the Catlins - I've learned precisely which materials hold up by the sea and which ones look tired a year later. This guide is the honest version of what I tell people who email me.
Salt is the problem, not just water. Tiny salt particles ride the wind inland, settle on surfaces, and hold moisture against the metal long after the rain has dried. That constant damp-salt contact is what drives corrosion - it pits bare steel, creeps under coatings, and stains finishes that would last decades anywhere else.
Two things decide how hard your spot actually is:
Work out which of those you are before you choose a material. "Coastal" covers everything from a sheltered courtyard to a clifftop in the spray - and they don't call for the same thing.
If you want a brushed steel sign somewhere with direct salt spray, this is what I'd point you to. Marine-grade stainless is 316 grade - it has molybdenum added specifically to resist the chloride (salt) corrosion that eats other metals. That's the difference that matters, and it's worth knowing: ordinary stainless (304) looks identical but isn't built for salt - left bare and brushed near the sea it will "tea-stain", a light brown surface bloom, within a season. For a brushed steel sign at a coastal address, always ask for 316.
A brushed 316 finish, like the custom address sign pictured above on a new coastal home, holds its look in conditions that would mark lesser metals. In the very harshest splash zones even 316 can pick up faint surface tea-staining over time, but it's cosmetic, not structural - a wipe-down with fresh water clears it, and the steel underneath is untouched.
Best for: a premium brushed-steel look in direct salt spray.
Here's the one a lot of people don't expect: aluminium is one of the best materials you can put by the sea. It has no iron in it, so it physically cannot rust. Instead it forms a thin, hard oxide layer that protects itself - the same reason aluminium is used all over boats and jetties. A great deal of my work is aluminium: all of my wall words, my black, white and gold house numbers, and most of my larger address signs (90cm and up) are cut from it.
It's solid aluminium, cut from a single sheet - not aluminium composite, the thin metal skin over a plastic core that a lot of cheaper signage is made from.
Because it can't rust, aluminium shrugs off coastal conditions that would mark other metals, and it's light, which makes bigger pieces easy to mount. It's usually powder-coated in black, white or gold. Over many years the coating can dull a little under hard UV, but you'll never get rust streaks running down your wall.
Best for: almost any coastal spot, including exposed ones - especially wall words, house numbers and larger address signs.
This is the one thing to get right. My powder-coated black, white and gold pieces are made from either aluminium or 304 stainless steel - and once they're coated, they look identical. By the sea, the metal underneath the colour is what decides how it lasts.
On aluminium, a chip or scratch in the coating is no drama - there's no iron underneath, so it can't rust. On 304 stainless, which isn't a marine grade, a chip in a high-salt spot can let corrosion get started at the bare metal. Both are perfectly good in a sheltered or set-back coastal setting; for a front-row home in the spray, choose the aluminium version, or a marine-grade 316 piece. Every piece on the site lists the material it's made from, so you can check before you buy - and if you're not sure, just ask: for a coastal address I'll make sure you get aluminium or 316.
I love corten and I make a lot of it - not just garden art but address and house signs too. Its warm rust patina is part of what makes a piece feel like it belongs against timber, stone or planting. But I won't tell you it's the right choice for every coastal spot, because it isn't.
Corten works by forming a stable rust layer that then protects the steel beneath. In a garden or a home set back from the water, that patina settles and seals beautifully. In constant salt spray, the salt can keep the surface actively corroding instead of letting the patina stabilise - so it never quite "sets". There's more on how corten ages in my guide to corten steel.
Best for: gardens, and address or house signs, set back from the spray - not the seaward face of a front-row home.
| Material | How it handles salt air | Best placement | Upkeep |
|---|---|---|---|
| Marine-grade (316) brushed stainless | The strongest brushed option - resists salt corrosion | Front-row, direct spray, premium signs | Occasional fresh-water rinse |
| Aluminium (usually powder-coated) | Can't rust - forms a self-protecting oxide layer | Almost anywhere coastal, even exposed; wall words, house numbers, large signs | Occasional rinse; coating may dull over years |
| 304 stainless (powder-coated black/white/gold) | Not marine grade - protected by the coating, but can corrode at a chip | Sheltered or set-back coastal | Touch up chips promptly |
| Corten (weathering) steel | Patina may not settle in constant spray | Gardens and signs set back from the water | None once the patina forms |
When you're genuinely in the spray, choose aluminium or marine-grade 316 stainless. When you're set back or sheltered, the whole range is open to you.
I've watched beautiful coastal pieces let down by the cheap screws holding them up. If you've chosen a rustproof piece for an exposed spot, mount it with marine-grade (316) stainless fixings too - ordinary screws will rust and bleed streaks down your wall, and they're usually the first thing to fail. Leave a small gap behind the piece where you can so air can dry the wall, and rinse everything down with fresh water now and then. Small things, but they're the difference between a piece that lasts five years and one that lasts thirty.
No - aluminium has no iron in it, so it can't rust. It forms a thin oxide layer that protects itself, which is why it's used so much on boats. It's one of the best coastal choices, and most of my wall words, black/white/gold house numbers and larger address signs are aluminium.
Marine-grade (316) stainless resists the salt corrosion that rusts and pits other steels. In the harshest splash zones it can develop light surface tea-staining over time, but that's cosmetic - it wipes off, and the steel underneath is unaffected. Just make sure a brushed coastal sign is 316, not 304.
For direct salt spray, go marine-grade: a brushed 316 stainless sign, or a black, white or gold sign made in aluminium - both shrug off salt. One thing worth knowing: my standard powder-coated black, white and gold address signs are 304 stainless, which is hard-wearing but isn't a marine grade - so for a front-row coastal spot, just ask me to make yours in aluminium or 316 instead. Corten address signs are lovely too, but I'd keep those set back from the spray.
They look the same once coated, so just ask me. Each piece does list its material on its product page, and for a coastal address I'll make sure you get aluminium or marine-grade 316 so it lasts.
If you get regular direct salt spray, corten isn't my first pick - its patina may not stabilise. Set back from the spray, in a garden or on a sheltered fence or entranceway, it ages beautifully.
Very little. An occasional rinse with fresh water to clear settled salt is all aluminium or marine-grade stainless asks. For coated pieces, touch up any chips before salt can get a start.
Yes - most of my work is made to order, so I can build your sign or wall art in the right material for exactly where it's going.
If you're not sure which material suits your spot, email me and tell me where you are - how much spray you get, how sheltered the piece will be - and I'll tell you honestly what will last, and make it in aluminium or marine-grade 316 if you're in the salt. I read every email myself and usually reply within a day. Everything is hand-finished here in Auckland, made to order, and ships within 48 hours with free NZ shipping over $250.
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