Necessary Preparation Before Painting Exterior Walls

Painting the exterior walls of your home can improve its aesthetic appeal and its value. However, before you can start painting, it is vital you have a clean surface that will increase the adhesion and durability of the paint. Essential preparation steps include:

Sanding and scraping

Surface preparation is the basis of any good paint job and the most difficult. Due to the required effort, it is advisable to hire a professional. DIY sanding can damage your exterior walls, and you may lack the required equipment. Exterior paint walls will have loose and flaking paint that you need to scrap off. Painting over flaking paint will only decrease the durability of the paint. You can make use of power sanders, but it is essential to use proper safety equipment, such as gas masks. This will protect your respiratory organs from the dust and paint particles.

Surface repair and cleaning

After loose paint is removed, you may notice damage areas in the wall. The damage may be from normal wear, climate or insect activity. Before you paint, you should attend to these repairs. You can use fillers to repair present cracks and ensure the filler dries before you wash the wall. Cracks and gaps can also be repaired using sealants, especially those near openings, such as windows. When using sealants, use products that can be painted over. Any rough spots remaining should be sanded to give a smooth finish.

A pressure wash is the best way to remove dirt and dust from exterior walls of your property. If there is mould present, you should scrub it off using a wire and sanitise the area using a bleach solution. Do not forget to protect the surrounding landscape by using plastic.

Apply primer

After repair and cleaning, you should apply primer to the walls. Primer offers an excellent base for paint to adhere to and allows for an exceptional finish. It is advisable to use a similar primer colour as the paint you intend to use. A primer can reduce the need for multiple layers of paint, especially for deep colour paints. On wood, primers prevent the exposure of wood to moisture, especially with thin layers of paint. This prevents rotting and growth of mould by making the wood waterproof.

There are different types of primers available for different surfaces and depending on the geographic conditions. There are, however, multi-purpose primers designed for universal applications, but they may not be suitable for all surfaces.

If you're not sure how to paint your exterior walls, contact professional exterior painters.


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