Timber outdoor furniture can age beautifully, but it does need the right care. If your table, chairs or bench are looking dry, faded or a bit tired after summer, oil may help bring back some warmth and improve its resistance to the weather.
The right product depends on the timber, its current finish and the look you are after. It is also worth knowing that not every outdoor wooden setting needs oil. Some timber is happy with a regular clean, while others benefit from a suitable exterior furniture oil.
First, work out what timber you have
The timber is the best place to start. Teak is one of the most common choices for outdoor furniture because it is naturally durable. It contains natural oils, which help it cope with changing weather and moisture.
Over time, teak often changes from a warm golden brown to a silvery-grey. This is normal. If you like that weathered look, you may not need to oil it at all. A gentle clean every so often can be enough.
If you would rather bring back the deeper colour of teak, a teak oil or outdoor furniture oil may be suitable. Just make sure the product is intended for exterior use and compatible with the timber.
Other timbers, such as kwila, eucalyptus, acacia or reclaimed hardwood, may also benefit from an exterior oil. Check with the furniture supplier or product manufacturer if you are not sure what your setting is made from.
Choose an oil made for exterior timber
For outdoor furniture, look for a product specifically made for exterior timber, decks or outdoor furniture. These oils are designed to help timber deal with moisture, UV exposure and everyday use.
A good exterior furniture oil will usually penetrate the timber rather than sitting heavily on the surface. This helps maintain the natural feel of the wood and makes future care more straightforward.
Teak oil is a common choice for teak furniture if you want to maintain a warmer tone. Deck and furniture oils can also suit many outdoor timbers, but always read the label carefully. Some are designed for certain species or previously oiled surfaces, while others are intended for rough-sawn timber rather than smooth furniture.
Clear oils maintain the natural timber colour, although they may make it look richer or slightly darker. Tinted oils can add warmth or help even out a patchy colour, but test them first. Timber absorbs colour differently depending on its type, age and condition.
When oil is not the answer
It is easy to assume oil will fix every timber problem, but sometimes the furniture just needs a clean.
If teak has gone grey but still feels sound and smooth, oil is a choice about appearance rather than a necessity. If the timber is dirty, mouldy or covered in old product, applying more oil straight over the top can make the surface look uneven.
Oil is also not the best option for timber that has been painted, varnished or sealed with a film-forming finish. In those cases, the new oil may not soak in properly. Check what finish is already on the furniture before choosing a treatment.
If the furniture is badly cracked, unstable or has deep rot, oil will not repair the underlying problem. It may still be possible to restore parts of the setting, but it is worth getting advice before putting time and product into it.
Prepare the furniture properly
A good result starts with clean, dry timber. Choose a clear day when the furniture has time to dry before and after the job.
Begin by brushing off loose dirt, leaves and dust. Wash the surface with mild soapy water or an outdoor timber cleaner that suits the product you are planning to use. If there is built-up grime, a soft brush can help lift it from the grain.
Let the furniture dry completely. This part is important. Oil applied to damp timber may not absorb evenly, and it can leave a patchy finish.
If the surface feels rough or has stubborn marks, a light sand with fine sandpaper may help. Sand with the grain, remove the dust and test the oil on an inconspicuous area before treating the whole piece.
How to apply outdoor furniture oil
Always follow the instructions for the particular oil you have chosen, as drying times and coats can vary. In most cases, the process is fairly simple.
Apply a small amount of oil with a clean cloth, brush or applicator pad, working in the direction of the grain. Pay attention to the ends of timber pieces, as these areas can absorb moisture more easily.
Leave the oil to soak in for the time stated on the label, then wipe away any excess. This step matters. Leaving too much product on the surface can make furniture feel sticky and attract dust.
One or two thin coats are usually better than one heavy coat. Let the furniture dry properly before using it, and keep it out of rain while the oil cures.
How often should you oil outdoor furniture?
There is no fixed timetable. It depends on the timber, the product, how exposed the furniture is and the look you want to maintain.
Furniture under a covered patio may need attention less often than a table sitting in full sun on an open deck. Rather than oiling to a schedule, look at the timber. If it is looking dry, faded or uneven after a clean, it may be time for another coat.
Too much oil can cause problems, so there is no benefit in applying it every few weeks. A clean and a quick check at the start and end of each outdoor season is usually a better habit.
Do not forget oil-rag safety
Rags used with some oil-based timber products can be a fire risk if they are left scrunched up in a pile. After finishing the job, follow the product label for disposal instructions.
As a safe rule, do not leave oily rags in a bucket, garage corner or rubbish bag. Fire and Emergency New Zealand advises that oil-soaked rags can self-ignite. Handle and dispose of them carefully before packing everything away.
A little care goes a long way with timber furniture. Choose the right exterior oil, apply it lightly and only when the timber needs it. That will help your setting keep its character while standing up to life outdoors.