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Writer's pictureAmiras Simeonidis

Painting Rendered Walls: How to Get the Job Done Right

Updated: Nov 7


Wondering how to paint those rendered walls so they look like they came straight out of a design magazine? 

Painting render can be tricky, especially if you want it to last. Many homeowners are frustrated when their paint starts peeling, fading, or cracking after only a short time. If you’re looking to refresh your walls with a durable, professional finish, there are a few key steps you’ll want to follow to get the job done right.

In this guide, we’ll walk you through everything you need to know to paint rendered walls with confidence. Let’s dive in!



1. Start with the Right Prep Work

The secret to a lasting paint job on rendered walls lies in the prep work. Painting on dirty or damaged render? Well, you’re setting yourself up for peeling paint and early touch-ups. Here’s how to get the prep just right:

  1. Clean the Surface: Dust, dirt, and even moss can cling to rendered walls. Use a pressure washer or a scrub brush with mild detergent to clean off any grime. Allow it to dry fully before moving forward.

  2. Repair Cracks and Damage: Check for any cracks or crumbling sections of the render. You can use a filler designed for exterior use to patch small cracks, but larger cracks might require professional attention to prevent water damage.

  3. Sand Down Rough Areas: Sanding removes uneven areas and helps create a smooth surface for the paint to grip onto. Pay special attention to any patched areas, as these will need to be as smooth as possible.

Prepping might take some time, but it’s essential for that flawless, long-lasting finish on your rendered walls.



2. Selecting the Perfect Primer for Rendered Walls

Rendered surfaces can be rough and porous, meaning they can absorb moisture and paint unevenly without a primer. To get a smooth and uniform base, priming is crucial:

  • Exterior Masonry Primer: For most rendered walls, an exterior masonry primer works best. It helps paint adhere better, giving you a more even finish.

  • Sealants for Porous Render: Some rendered walls can be particularly porous. In this case, a sealer will prevent excessive absorption, save paint, and help you avoid a patchy look.

Applying primer not only gives your paint a consistent base but also prevents moisture from seeping through, which could lead to flaking and cracking over time.



3. Choosing the Right Paint for Your Rendered Walls

When painting renders, not just any paint will do. Here are a few things to keep in mind when selecting the right one:

  • Masonry Paint: Masonry paint is specifically formulated to withstand weather changes, moisture, and sun exposure, making it ideal for rendered walls.

  • Elastomeric Paint: This type of paint stretches and contracts with temperature changes, helping to prevent cracking. It’s especially useful if you live in an area with fluctuating weather.

  • Breathable Paint for Damp Areas: If your walls tend to get damp, breathable paint allows moisture to escape without compromising the paint layer.

Tip: Dark colours might look stylish, but they absorb heat and can cause paint to wear faster. Lighter colours tend to hold up better over time.



4. Applying the Paint: Tips for a Flawless Finish

Now that you’ve chosen the perfect primer and paint, it’s time to apply it. For a smooth, professional finish on your rendered walls, follow these steps:

  1. Use a Roller for Large Areas: For broad surfaces, a roller will save you time and ensure an even coat. For textured renders, consider using a roller with a thicker nap to get into all those nooks and crannies.

  2. Brush for Edges and Details: Use a paintbrush for edges, corners, and other detailed areas. You’ll get better control and avoid mess.

  3. Apply Two Coats: For a strong, long-lasting finish, two coats are generally recommended. Allow the first coat to dry thoroughly before applying the second.

  4. Watch the Weather: Exterior painting should be done in mild weather. Avoid painting on rainy, windy, or extremely hot days, as these can affect drying time and paint adhesion.

With a little patience, you can achieve a clean, professional-looking finish that’ll last for years.



5. Avoid These Common Mistakes

Here are a few pitfalls to watch out for when painting rendered walls:

  • Skipping the Primer: Without primer, paint can peel and fade much faster on render. It’s worth the extra step!

  • Painting in Harsh Weather: Hot, sunny days may seem perfect for painting, but they can cause paint to dry too quickly, leading to an uneven finish.

  • Using the Wrong Paint Type: Masonry paint might seem like a more expensive choice, but using regular paint on rendered walls will likely lead to early flaking and touch-ups.

Avoiding these mistakes can save you from frustration and future repainting.



Wrapping Things Up

Painting rendered walls might feel like a big task, but with the right steps, you can achieve a long-lasting, beautiful finish. 

By focusing on solid prep work, choosing the right primer and paint, and applying it with care, your walls can look fresh for years. Ready to tackle the project? 

If you’d like a professional hand or need guidance, our team is just a click away and happy to help bring your vision to life.



FAQs

1. Do I need to use a primer before painting rendered walls?

Yes! Primer helps the paint adhere better and reduces the chance of peeling or fading. It’s particularly important for porous rendered surfaces.


2. How long should I wait between coats when painting render?

Allow each coat to dry for at least 4-6 hours, but always check the specific paint’s instructions. Humidity and temperature can impact drying time.


3. Can I paint rendered walls in any weather?

The best conditions are mild, dry days. Avoid extreme heat, rain, and high humidity, as these can affect drying time and paint adhesion.


4. What’s the lifespan of a paint job on rendered walls?

With proper prep, high-quality paint, and the right application, your paint job can last anywhere from 8 to 10 years on rendered walls.


5. Can I use interior paint for rendered walls?

No, interior paint isn’t designed for outdoor conditions and will likely crack and peel quickly. Always opt for exterior or masonry paint for outdoor render.

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