Did you know you can paint uPVC windows in a transformative weekend DIY project? These 6 steps from professional decorators will guarantee a smooth finish that stands the test of time

Did you know you can easily paint your uPVC windows, also referred to as vinyl windows? It's a great low-cost makeover option and can help you achieve your desired aesthetic in a matter of hours.

Painting uPVC windows is a DIY project you can complete in one weekend and the results will last, say our professional painters and window experts. But, you will need to use the right tools for the job, follow these six steps and avoid common mistakes such a painting when it's raining or too hot.

Can you paint uPVC windows?

First though, many people worry that painting their uPVC windows is a bad idea or will result in a patchy finish that peels – thankfully, this is not the case.

Gal Cohen, window expert and manager of JDM Sliding Doors says, 'Many people assume you cannot paint uPVC, but with the right steps, you can get a smooth, long-lasting finish.'

That said, it pays to be aware that this is a task which requires the right DIY tools, products and a degree of patience.

Eli Massar, founder at Smooth Sailing Painters says, 'Theoretically, you can paint your vinyl windows a new color or simply refresh them, but, window painting, in general, is one of the more difficult DIY painting tasks, and it’s complicated by the fact that vinyl windows were designed and manufactured to favor cleanability and low purchase cost over 'paintability'.

'Vinyl’s best property is its 'cleanability' so If you like the current color but it’s looking shabby, try cleaning your windows and frames first. There’s a very good chance that you’ll make a major improvement,' continues Eli. 'However, if cleaning isn’t the solution and, if you’ve got gumption and detail-oriented patience, you have found the perfect project.'

uPVC painting essentials

Step 1: Clean the windows thoroughly

Before you do anything else, you need to know how to clean windows and their frames in order to get them spotless.

Allan Reid, uPVC specialist and founder of Art Windows & Doors says, 'Start by washing the uPVC with warm soapy water or a degreaser to remove any dirt, grease or grime. Ensure it’s completely dry before moving on.'

'Wipe everything down with isopropyl alcohol to remove oils that remain,' adds Gal Cohen. 'You must do this step because the paint will not adhere well to a dirty surface.'

Allan points also points out it's wise to check the weather forecast before starting your painting. 'The temperature should be above 41°F for proper drying,' explains Allan. 'Avoid painting in direct sunlight or damp conditions too.'

Step 2: Lightly sand the window frames

This next step is one that applies to all materials, whether you are painting exterior windows made from timber or uPVC. It will ensure your new coat of paint will adhere to the windows properly and provide a long-lasting finish.

'Using fine-grit sandpaper (around 220 grit), gently roughen the surface to help the paint adhere better,' advises Allan Reid.

'After sanding, wipe off the dust with a clean, dry cloth,' further advises Gal Cohen.

Microfiber cleaning cloths from Target are perfect for the job. When you wash them, forgo the fabric softener so your cloths retain their water absorbing quality.

Step 3: Remove window hardware

To make the task of painting as easy as possible, you next want to remove anything that is going to make it more fiddly. At the same time, take note of the best interior painting tips and make sure you cover up any surfaces you don't want to get paint on.

'Where possible, take off window handles and any removable trim to avoid accidental paint splashes,' advises Allan Reid. 'Then, mask off surrounding areas. Use masking tape to protect any parts you don’t want to paint, such as glass panes and nearby walls.'

Frog Tape, available in multi-packs at Amazon has clever Paintblock technology that puffs up the tape when it gets damp, stopping paint seeping under the crisp line you're going for.

Step 4: Apply a primer

Never ever be tempted to skip applying a coat of primer – this is key to the longevity of your new finish.

'Apply a plastic-specific primer, like Zinsser Bullseye 1-2-3,' suggests Gal Cohen. 'This will help the paint adhere better and last longer. Let it dry completely before moving to the next step.'

If you have dark uPVC or are going for a darker makeover, try the gray Zinsser Bullseye 1-2-3 from Lowe's for ease of coverage. This primer can be used on all kinds of surfaces, but works particularly well on hard-to-paint finishes, including uPVC. We love that it will be dry and ready for a re-coat in just one hour, speeding up the process of painting your windows.

'While some uPVC paints don’t require a primer, applying one can enhance durability and adhesion,' adds Allan Reid. 'If using a primer, apply an even coat and let it dry fully.'

Step 5: Apply your paint

There are two ways of applying paint to uPVC windows – using a spray paint designed for plastics, or going in with a brush and roller.

'Spray painting is a great way to get an even, professional-looking finish without brush marks,' explains Gal Cohen. 'It works very well for larger windows or those with intricate details.

'If you prefer more control over the application, using a brush and roller is a great option as well,' continues Gal. 'This works well for smaller windows or areas where over spray could be a concern.'

If you choose to use a spray paint, Gal advises, 'Apply a high-quality spray paint designed for plastics, such as Rust-Oleum Universal All Surface Spray Paint [available at Lowe's in Matte, Satin and Gloss]. My advice here is to use multiple light coats rather than one thick coat. This is because thick coats take longer to dry, increasing the risk of drips, uneven coverage, and peeling over time. When you are spraying, hold the can about 8 to 10 inches from the surface and spray in smooth, even strokes. Let each coat dry before applying the next.'

For those who prefer the idea of using a brush and roller, Gal explains the best way to proceed for optimal results.

'Apply a bonding primer made for plastics [we think INSL-X SXA11009A-01 Stix Acrylic Waterborne Bonding Primer from Amazon is a great option as it provides a really strong bond]. Use a synthetic brush here to get into corners and a foam roller for smooth sections. After that, let it dry according to the manufacturer’s instructions.

'Once the primer is set, use a high-quality uPVC paint designed to flex with the material, which prevents cracking and peeling over time,' continues Gal. 'Apply with a foam roller for large sections and a small brush for edges. My advice is to give two to three thin coats because this will give the best coverage.'

Great paints for the job

Step 6: Finishing touches

Once your paint is completely dry, reattach your window hardware.

'Once fully dry, carefully remove the masking tape and reattach any fixtures,' says Allan Reid.

This is also a good time to look at how to weatherproof your windows if you have found them to be a little draughty.

FAQs

Can you paint windows in the rain?

While you might be keen to get started on this project, painting in the rain, drizzle or fog is not a good idea as the precipitation can hamper a smooth and even finish.

'Painting exterior doors and windows when it’s raining is never a good idea. Rainwater on the surface will stop the paint from adhering properly, leaving you with an uneven, streaky finish,' explains Allan Reid. 'Even if it’s not raining, excessive moisture in the air can interfere with the paint, leading to issues like mildew, condensation or a tacky finish.

'This is especially problematic if you’re using a spray gun or aerosol application. Humidity also affects drying times, so for the best results when painting outdoors, choose a day when humidity is low.'

Will painting in the heat ruin the finish?

It isn't just wet conditions that could put a perfect paint finish at risk, hot sun could also be problematic – this is a good task to add to your spring home maintenance jobs.

'If it’s too warm, the paint may dry too quickly, causing adhesion problems,' explains Allan Reid. 'For uPVC painting, the ideal air temperature is between 50°F and 77°F. Also, keep in mind that direct sunlight can heat the plastic, making application trickier – so it’s best to paint in the shade and avoid the midday heat.'

And, finally, watch out for windy conditions too.

'A windy day can send dust and dirt straight onto your freshly painted surface before it has had time to set,' points out Allan. 'To avoid this, use a fast-drying uPVC paint, which minimizes the risk of airborne debris ruining your finish. If your paint takes too long to dry, dust particles can settle and spoil the end result.'

Meet the experts

Allan Reid

Allan Reid has an in-depth knowledge of uPVC and is founder of Art Windows & Doors, specialists in uPVC windows, doors and door canopies.

Gal Cohen

Gal Cohen is an experienced professional with a rich background in the sliding door and window industry, currently serving as the business development leader and field area manager at JDM Sliding Doors.

Eli Massar

Eli is a professional painter who has recently launched his own business, Smooth Sailing Painters. Eli believes that painting projects should not be stressful. Eli provides interior and exterior painting services, including cabinet painting, wood staining, furniture painting, epoxy floor application, and drywall and trim repair.

Before opting for the ever-popular white to refresh your windows, take a little time to look at other paint colors for the exterior of a house – you could just be missing a trick that adds immediate curb appeal.