Teak oil vs teak sealer: what should you use on teak?

Protector, sealer, shield, teak oil: the DIY store or garden centre has a whole shelf of products for teak, and the names don’t help. This page puts them side by side based on what the manufacturers themselves write, explains why most garden furniture brands advise against teak oil outdoors (and who disagrees), and what that means for your garden table. The full overview of all routes is in how to treat teak.

First question: do you want it to go grey?

The product follows from the colour you want.

• Grey is fine, but you want fewer stains: a protector or a “shield”-type product.
• You want to keep the warm brown colour: a sealer with UV protection, and then keep maintaining it.
• It’s indoors: then the outdoor story hardly applies, and oil, wax or lacquer are common finishes.

Letting it go grey and doing nothing is a perfectly valid choice too; Gloster recommends it itself, with just an occasional clean (Gloster). More on that in letting teak go grey.

What each product does

Note: the names are not standardised. What one brand calls a “protector” is a sealer or shield at another. So read the description on the label.

Protector (stain protection, the wood may go grey)

At Tribù, the protector is meant for people who like the silver-grey patina: an invisible film that protects against stains (Tribù instructions). Gloster describes its protector as a product you can also apply to weathered teak to repel moisture and prevent stains from food and drink (Gloster). Tribù also says teak used indoors or on a veranda does not turn grey; there, a protector is enough as stain protection.

Tinted versions exist too: the Dutch furniture company Hartman sells its protector in three shades, including a light grey (Hartman, Dutch).

Sealer (keeping the colour)

Tribù’s sealer contains UV-blocking agents and slows down the greying “considerably”; it cannot prevent it (Tribù instructions). Gloster says its sealer helps maintain the brown colour of fresh teak “without darkening the teak too much”, and has you test it on a hidden spot first (Gloster). The Dutch furniture company Hamilton Bay talks about an “oil sealer” whose polymers make the wood waterproof while letting it breathe, and advises applying it twice a year (Hamilton Bay, Dutch).

Confusingly, Vincent Sheppard calls its product for keeping teak looking “fresh out of the box” a protector (Vincent Sheppard).

Shield or patina protector (staying grey, without the green)

A third kind of product keeps the wood silver-grey but repels moisture and dirt. Vincent Sheppard calls its version a teak shield: an invisible layer that stops liquids penetrating the wood, applied once or twice a year (Vincent Sheppard). The Dutch furniture company Traditional Teak describes its patina protector as a product based on synthetic polymers that keeps the silver-grey even for longer and counters green algae (Traditional Teak, Dutch).

Teak oil

According to the Dutch paint specialist Peltenburg, teak oil contains natural oils with a proportion of resin, and gives teak “the deep, warm tone of wet wood”; each extra coat makes it a little darker (Peltenburg, Dutch). That darkening is an important difference from sealers, which aim to hold on to the light colour of new teak.

Overview

Product	Colour	Purpose	Frequency (per manufacturer)
Protector (Tribù/Gloster meaning)	goes grey	repel stains and moisture	Gloster 1×/year, table tops 2×; Tribù at least 2×/year
Sealer	stays brown for longer	UV protection, slows greying	Gloster at least 1×/year; Tribù 1×/year
Shield / patina protector	silver-grey	repel moisture, dirt, green algae	Vincent Sheppard 1–2×/year; Traditional Teak 1×/year
Teak oil	darker, warmer	nourish, deepen the colour	Peltenburg 1–2×/year outdoors

Sources: Gloster, Tribù instructions, Vincent Sheppard, Traditional Teak, Dutch, Peltenburg, Dutch.

Why garden furniture brands advise against teak oil outdoors

Here the big manufacturers are remarkably united:

• Gloster: teak is naturally oily already and extra oil adds no protection. If it is oiled regularly, mould can form on the oil left on the surface, gradually turning the teak black. That black can then only be removed by “aggressive sanding” (Gloster).
• Tribù: don’t use linseed oil or teak oil; they “can cause irreversible damage” to the teak (Tribù instructions).
• Vincent Sheppard: advises against teak oil or any other wood oil on outdoor teak, because extra oil adds no additional protection (Vincent Sheppard).
• Traditional Teak, which sells a sealer itself, writes that black dots are usually fungi and algae feeding on moisture and sun-warmed teak oil, and that in its view teak treated with ordinary teak oil turns grey again within four to eight weeks (Traditional Teak, Dutch).

Who disagrees

It isn’t unanimous. Peltenburg actually recommends teak oil for garden furniture and outdoor tables, once or twice a year (Peltenburg, Dutch), and the Dutch furniture maker Souren names oiling every year as a way to prevent greying (Souren Meubels, Dutch). In the US, the site of furniture retailer Castlery recommends teak oil as a step when restoring outdoor teak (Castlery US).

In short: Gloster and Tribù warn about mould on oil, Vincent Sheppard sees no added protection in it, and none of the advocates addresses that mould risk. For garden furniture, a protector or sealer is therefore the more obvious choice. If you use oil anyway, you need to know where the pitfall lies.

Teak oil on a garden table: if you do it anyway

If you deliberately choose oil, these are the rules Peltenburg itself gives (Peltenburg, Dutch):

1. Clean and let it dry completely.
2. Sand lightly to at least 180 grit and remove the dust.
3. Apply thinly with a brush or cloth, along the grain.
4. After 15 to 30 minutes, wipe off all excess product with a lint-free cloth. Oil left on the surface dries slowly, attracts dirt and stays sticky.
5. Two thin coats are better than one thick one.

And a safety point that applies to any drying oil: oily rags can self-ignite as they heat up. Let them dry spread out, or keep them in a jar of water before you throw them away (Peltenburg, Dutch).

Bear in mind that after oil you can’t simply switch products (see below). For table tops, Gloster’s routine with a protector in April and October is the simpler route (Gloster); everything about tables is in teak table care.

Switching: from oil to protector, or from sealer to shield

Combining or switching products often goes wrong. What the sources say:

• From oil to sealer: Traditional Teak says its sealer must never go directly onto oiled teak, because it can give a blotchy discolouration; clean it first with a cleaner that removes the oil (Traditional Teak, Dutch). The Dutch site Verftechnieken points out that oil doesn’t just sit on the wood but soaks into it, which makes an old oil layer hard to remove (Verftechnieken, Dutch).
• Between protector and sealer: Tribù says you can’t use the two on the same surface; to switch, you first sand and leave the wood for one to two weeks (Tribù instructions). Gloster, by contrast, advises its protector on top of its sealer (Gloster). Both are right for their own system.
• Mixing brands: Gloster advises against using paints, oils, varnishes or stains other than its own sealer and protector (Gloster). So stick to one system.

Common mistakes

• Too much product. Both Tribù (protector and sealer) and Peltenburg (oil) warn that too thick a coat turns sticky (Tribù instructions, Peltenburg, Dutch).
• Applying it to damp wood. Hartman: the furniture must be bone dry, or discolouration or stains can appear (Hartman, Dutch).
• Rain shortly after treating. Tribù: keep the furniture dry for 24 hours to avoid water stains, and don’t cover freshly treated furniture (Tribù instructions).
• Varnish or lacquer outdoors. Gloster: paint and varnish don’t adhere properly to teak and start to peel off after a short while (Gloster).

And indoors?

Indoors it’s a different story. The Dutch timber information centre Centrum Hout names oil and nitrocellulose lacquer as finishes for teak, and notes that polyester lacquers dry poorly on teak (Centrum Hout, Dutch). Peltenburg recommends an “improved wood oil” rather than teak oil indoors (Peltenburg, Dutch). The details per piece are in indoor teak care and teak table care. For the outdoor routine step by step: how to treat outdoor teak furniture.