Unprotected wood ages under the influence of sun and rain. The wood then becomes grey and fibrous. Any untreated wood construction installed outdoors sooner or later turns grey. The lighter the wood you choose, the faster it wears out. Soft types of wood such as cedar, pine or fir, therefore quickly turn grey if not treated in a short time.

Your frame of wooden windows and doors are altered? Don't panic; you can still paint them correctly. Besides, you won't have much more work - apart from sanding - than if you painted new frames and doors.


Wooden window frames and doors are exposed to bad weather and wind. This can sometimes cause algae, moss and mould to form. Especially if the windows and doors are not properly maintained. Are you facing algae, moss or mould problems? Use a suitable product to remove them and then rinse thoroughly with water.

Sand Window Frames And Wooden Doors

For window and door frames with weathered wood, begin sanding with coarse sandpaper. Use a 60 or 80 grit paper to do this and sand until the original wood colour reappears. If possible, use a sander.

Then repeat the sanding, this time using a finer grit paper: between 150 and 180. Always sand in the direction of the grain of the wood. Never sand in circular movements.

Carefully dust off the support and affix masking tape (for flat and smooth surfaces) to the glass. Make sure that a small area of ​​glass is still visible between the tape and the wood so that the paint adheres best.

Application Of The Primer On Weathered Wood Frames And Doors

When sanding is complete, your wood is ready to paint, and you can apply the primer. For this, in theory, two solutions are possible: a water-based primer coat or a solvent-based primer coat. In the case of weathered wood, we recommend applying a coat of TRADE Universal Primer solvent-based primer.

Some types of wood contain water-soluble pigments. This is particularly the case with Merbau, afzelia and other dark exotic woods. When you apply water-based products, these pigments can dissolve and cause stains on the paint. In this case, always apply 2 coats of TRADE Universal Primer.

After applying your primer, it may be necessary to fill in any holes or cracks (not to be done before primer application). 

Before finishing, sand the primer coat using a finer grit paper (180).

Painting Weathered Window And Door Frames: The Finish

There are three ways to finish painting weathered window and door frames: opaque, semi-opaque and transparent. Attention, in the case of a semi-opaque finish, the primer coat is unnecessary!

Opaque finish

In the case of an opaque finish, you paint your wooden frames in the desired colour. The wooden structure is almost completely covered. The result is smooth and clean.

Here too you have the choice between a water-based or solvent-based topcoat. Water-based lacquers like Satineau have a significant advantage: their shine and colour intensity stay intact longer. The layers become powdered less quickly compared to lacquers in the solvent phase. 

This is an additional advantage in case of frequent exposure to the sun or when using darker colours. In contrast, solvent-based lacquers are easier to apply because they dry less quickly.

Even if you use a solvent-based primer as a primer, then nothing prevents you from finishing the job with a water-based lacquer.

In either case, be sure to apply two coats for the finish. Sanding with a 180 grit is always recommended.

Semi-opaque finish

If you opt for a semi-opaque finish, the structure of the wood remains visible in the paint, no matter what colour you choose.

In the case of semi-opaque finish, you do not need a primer. The paint is prepared using a process that combines two coats into one. Products such as Woodline or opaque stain are ideal and allow the wood structure to remain clearly visible. These are two solvent-based products.

Transparent finish

In case of clear topcoat, use one coat of clear primer, then apply two topcoats (e.g. Woodair natural ). You can also go for a colourful variant. Woodair is solvent-based, and we prefer this solution to water-based alternatives when we are dealing with weathered wood.

Ideal Climatic Conditions

Climatic conditions play an essential role in the outcome of your painting work. The painting below 10 ° C is not recommended, and 5 ° C is an absolute minimum. The ideal temperature is between 15 and 20 degrees. We recommend that you paint in the shade, when the sun has passed, and the wood is still warm. Any residual moisture is then removed from the wood, and you are less likely to experience bubbles in the paint. When there is too much humidity in the air (in fog or in rainy weather), keep your painting equipment neatly stored! This advice is also valid when it is too windy.