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Spray Painting a Heavily Textured Pebbledash House Exterior

When it comes to painting the exterior of a house, any professional painter would list pebbledash as one of the worst surfaces to paint. The heavy texture, with small pebbles protruding across the surface, makes painting with rollers very difficult. To paint the surface with paintbrushes means jabbing them between every stone which is time-consuming, laborious and does not cover the surface effectively.

Ben Westwood from GB Smart Spray takes a different approach. Ben explains, “For years we have been spraying pebbledash using exterior masonry paint. Spraying allows us to complete the painting much quicker which reduces the amount of labour time. We can cover the entire surface with paint to protect it and keep it looking good for years.

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Instructions: How to coat the pebbledash with the airless technology

1. Cleaning the surface

As with any painting project, the initial preparations and cleaning of the surface are very important to get a good finish which not only looks great but will last for years to come.

Ben comments, “the pebbledash needs to be prepared properly by first making sure the surface is clean.

A proprietary cleaner is applied to remove any dirt and grease. Then a wire brush is used on areas with moss, or algae or any loose flaky paint if the surface has been previously painted. The whole surface is then jet washed. Any defects in the surface are then repaired with additional pebbledash render and cracks are filled with suitable fillers.

If the surface is chalky or powdery then stabilising primer is applied to seal the surface. The wall and fillers are left to dry for 24 hours prior to spraying. This ensures that the wall is ready and makes for the best possible paint adhesion and coverage.

If you want to see additional information on spraying exteriors please see our Construction Siteguide

Spraying Masonry Paint

Wagner Group SuperFinish 23 Pro Buntsteinputz Fassade Nahaufnahme

2. Masking

During the drying process, the window frames are masked up using a combined masking tape and plastic sheet. Brickwork that is not to be sprayed is either masked or covered with dust sheets.

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3. Prepare paint and machine

The masonry paint is then prepared and diluted as required, in this case, the paint was able to be used straight from the tin and loaded into the 5 litre hopper. The hopper attaches directly to the spray machine via a threaded connection which is as simple as putting on the normal suction hose.

Ben wears essential safety equipment including eyewear, gloves and a mask. He uses the Wagner SF23 Pro with a 5 litre hopper which makes the machine easy to move about on site and also quick to setup, refill and clean after use.

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4. Coat the pebbledash exterior

This sprayer is supplied with a 30 m hose which allows Ben to work on the entire project without needing to move the machine. As no paint needs to be moved about the site this saves time and reduces the effort needed to complete the job. It also keeps wet materials in one location reducing any potential spillages on site.

A first coat is applied, systematically working both up and down and from side to side across the wall. Each pass is overlapped by approximately 30%. The end of the spray tip is kept 15–20cms from the surface and is moved at a steady pace. A short extension piece is used to make sure none of the surface is out of reach.

The first coat is allowed to dry thoroughly according to the paint manufacturer’s recommendations (approx. 2-4 hours at 20° C). The spray painting process is then repeated to apply the second coat. Once the second coat of paint is dry, the masking materials are removed.

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That is the project complete and the transformation is evident, updating the look of the property gives the exterior a complete refresh.

Ben commented, “as you can see, we have achieved a perfect paint finish that is durable, long-lasting and the client is delighted. We have already received enquiries from other potential new customers in the same road that want their property exterior to be given a fresh new look, using our approach of spray painting”

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Which WAGNER unit is suitable for spray painting pebbledash?

Our airless sprayers are suitable for professional use. These have the appropriate performance and are particularly suitable for professional painters and specialist companies.

SuperFinish 23 Pro Spraypack

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5-litre capacity for emulsion applications

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