Guide to paint exterior walls

While painting a wall is always done the same way, there are a few precautions to take when you are working outdoors. Indeed, outside walls are subjected to many climatic hazards. It is therefore essential to use the right method when you are painting an exterior wall. Hamilton tells you more about painting an exterior wall and on the best way to do it!

Choosing the right exterior wall paint

The first step will be to choose a suitable paint. Indeed, any exterior structure is exposed to humidity, but also pollution and wind. Therefore, your exterior paint must be particularly tough!

Therefore, you should first choose a special outdoor paint. This choice will also depend on the desired effect on the walls.

Acrylic paint will be used for a contemporary effect, provided that the wall is perfectly flat. For a traditional effect use a textured paint instead, ideal on a wall with an uneven surface.

The right method to paint an exterior wall

Once you know which exterior paint you're going to work with, it's time to follow a rigorous method to make sure to paint these exterior walls successfully.

Here is our step-by-step method for a flawless exterior paint:

Preparing the wall

Painting an exterior wall requires first and foremost that you actively prepare the wall. The surface must be clean, flat and smooth to ensure the total adhesion of your exterior paint.

The preparation will necessarily go through the following steps:

  • Cleaning the wall: ideally using a high-pressure cleaner, unless the wall is friable.
  • Stripping: if the old paint on the exterior wall is crumbling, it will be necessary to remove it completely. To do this, use a wire brush over the entire surface. You will also need to scrub away any traces of mould or fungus.
  • Repairing the wall: if the exterior wall you're working on has cracks or holes, you will have to fill them with an exterior coating or quick-setting cement. Once the plaster is dry, remember to sand the surface to flatten the wall and then dust it off.
  • Protecting the exterior: painting an exterior wall is often a messy job. So, think about protecting all the elements that should not be painted, such as windows or doors. To do this, apply masking tape. You can also put a tarpaulin on the floor to avoid dirtying the outside flooring or damaging the plants.

Don’t forget the underlay

Once your wall is perfectly prepared, you will be able to apply the undercoat primer. This will allow you to paint the exterior wall more quickly, preventing it from absorbing the layers of paint.

To paint an exterior wall, it is best to use a roller. You will paint from top to bottom, applying the undercoat over the entire surface.

Use a brush to paint corners and areas not accessible with a roller.

Now let’s start painting

Once the undercoat is completely dry, you can finally begin to work on the exterior paint. For an impeccable result, it is preferable to apply two coats of paint, while always respecting the drying time.

Always work from top to bottom, covering areas of about 1m2, which you will overlap.

To avoid visible traces when drying, try to paint each side of the outside wall in one go. Similarly, avoid painting when it is too sunny. It is preferable to paint in the early morning or at the end of the day so that the paint has time to dry properly.

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