How To Paint UPVC Windows | A Step-by-Step Painting Guide

As a homeowner, keeping your property looking its best often means tackling maintenance and improvement projects. One task that can significantly impact your home’s curb appeal is repainting the exterior windows.

For those with unplasticized polyvinyl chloride or UPVC windows, the process requires some additional considerations. UPVC is a common, low-maintenance alternative to wood, but its durable and glossy surface poses challenges when it’s time for a refresh. 

Also read; Can You Paint UPVC Windows?

However, with the right supplies and technique, you can achieve a professional-looking finish and learn how to paint UPVC windows.

Preparing to Paint UPVC Windows

Preparing to Paint UPVC Windows

To properly prepare UPVC windows for painting, there are a few essential steps to take.

You will need:

  • Sandpaper (220-400 grit)
  • Tack cloth
  • Primer (oil-based for UPVC)
  • Paint (latex or oil-based)
  • Paintbrush
  • Paint tray

1. Cleaning the UPVC

First, clean the UPVC to remove any dirt or debris. Use a damp cloth to wipe down the entire surface. For stuck-on messes, you may need to scrub a bit harder. Make sure the UPVC is completely dry before moving on to the next step.

Also read; How to Remove Paint From UPVC Window Frames

2. Lightly Sanding the Surface

Lightly sand the UPVC with fine-grit sandpaper (around 220-400 grit) to slightly rough up the surface. Wipe away dust with a tack cloth. This process helps the primer and paint adhere better to the non-porous UPVC. Be very gentle to avoid damaging the UPVC.

3. Applying a Primer

Apply a coat of oil-based primer to the UPVC and let it dry as directed. For the best results, you may need to apply two coats of primer.

Make sure each coat is fully dry between applications. The primer helps the paint stick to the UPVC, ensuring an even and long-lasting finish.

Painting UPVC Windows- Step By Step Process

To successfully paint UPVC windows, proper preparation and technique are key. Follow these steps to get professional-looking results:

1. Cleaning and Priming

cleaning the UPVC window

First, clean the UPVC windows thoroughly to remove any dirt or debris. Then apply a primer specifically designed for UPVC, like Zinsser Bullseye 123 Primer, and let it dry as directed. The primer helps the topcoat adhere properly.

2. Choosing Paint

Select an acrylic exterior paint rated for use on UPVC. Water-based acrylic latex paints work well and provide good coverage. Oil-based paints are not compatible with UPVC and will not adhere properly.

For the best results, use a paint specifically formulated for painting vinyl or plastics.

3. Applying the Paint

Applying the paint

Apply two or three thin coats of paint instead of one thick coat.

Thin, even coats look the best and are less likely to drip. Use a high-quality brush to paint the edges and trim, then use a roller for large, flat areas. Let each coat dry completely between applications as directed by the product instructions.

4. Dry Time and Protection

Once the final coat is applied, allow at least 24 to 48 hours of dry time before handling the windows or exposing them to moisture.

This allows the paint to cure fully. To protect the new paint job, apply a clear topcoat like polyurethane. A protective topcoat helps prevent scratches and weathering, keeping UPVC windows looking freshly painted longer.

Caring for Newly Painted UPVC Windows

Once you have applied a fresh coat of paint to your UPVC windows, proper maintenance and care are required to maximize the lifespan and appearance of the new paint finish.

It is important to note that UPVC windows are made of plastic and the porosity of the material may cause the paint to chip or scratch more easily than on other surfaces.

By following the guidelines below, you can help ensure your newly painted UPVC windows retain an attractive appearance for as long as possible.

  • Clean painted UPVC windows regularly using a soft, damp microfiber cloth to gently wipe away dirt and debris. Avoid using harsh chemicals, abrasive cleaners, or solvents which could strip the paint.
  • Touch up any scratches, chips or marks in the paint as soon as possible using the original paint color. The longer marks are left exposed, the more opportunity for moisture or weathering damage. Even small imperfections should be addressed promptly.
  • Limit direct exposure to environmental elements like strong sunlight which can cause paint to fade over time. Where possible, use curtains or blinds when windows are not in use.
  • Consider repainting UPVC windows every 3 to 5 years depending on weather conditions and sun exposure. While quality paint can last longer, repainting at regular intervals will provide the best appearance and protection.

How to Paint UPVC Window- The Conclusion

Now that you know how to paint your UPVC windows, you can stand back and admire your work. The time and effort spent will be well worth it as you see your newly painted windows transform the look of your home.

 By following the proper steps to clean, sand, prime, and apply two coats of paint, you have given your UPVC windows a durable finish that will last for years to come.

The next time you need to paint UPVC windows, you will have the confidence to do it yourself and create a custom look for your home. With some patience and the right techniques, painting UPVC windows is an achievable DIY project for any homeowner looking to update their space on a budget.

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Advanced Painters

Advanced Painters are professional painters and decorators in the Home Counties. From exterior painting and rendering, to uPVC window spray painting and interior decorating, we produce high quality finishes that will transform the appearance of your property.

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