
We understand that painting sash windows is a frustrating and challenging task. However, I am here to help you avoid potential pitfalls that may arise. One common annoying issue often arises with sash windows is when they become stuck or don’t operate smoothly.
This can be quite inconvenient and frustrating, but I have a comprehensive guide on the painting methods to create a clean and fresh look for your windows.
It’s important to note that different sash window types may require slightly different painting methods, and some may not need any painting. For instance, timber windows are prone to flaking over time, whereas UPVC windows will likely not require painting, depending on your preference.
See also: Uk Paint Brands
Contents
Our Guide To Sash Windows Painting
Before painting sash windows, there are a few important guidelines to remember:
- Prepare your space. Consider using a sheet or plastic covering to protect the floor from accidental paint drops.
- Consider sanding the casements to move any flaking paint. Suppose the window is already in good condition; taking off the existing may not be required.
- Clean the area. This will prevent any dust from getting into the paint.
- Paint with short brush strokes. This technique will give you a cleaner finish.
- Remove any handles or locks. This helps in achieving a smooth and tidy paint job.
- Run masking tape along the exterior edge of the casements. This ensures the walls are protected from any paint.
Start by pushing the lower section of the sash window to the top and painting it first. This will allow you easy access to all parts of the frame, ensuring thorough and even coverage.
Following these guidelines will help ensure your windows painting project for the sash windows goes smoothly and results in a clean and professional finish.
However, despite following the procedures above, remember these 5 tips when painting oil to achieve outstanding results:
TIP 1 - Masking tape can also protect draught-proofing or Weatherfin from paint.
See also: Best Masking Tape For Painting
Removing the Old Paint

To repaint your entire window, first, remove the old paint from the sashes and frame. Keep in mind that the paint may contain lead. Therefore, wearing a suitable protective dust mask is important for your safety.
TIP 2 - When using a heat gun for removing paint, ensure you don't expose elements of Sealing System to excessive heat.
Send the Timber

To ensure a clean line when painting, follow these steps after sanding the window frame:
- Brush away any dust from the frame
- Moisten a sponge with water (no soap)
- Wipe the frame down with the moist sponge
TIP 3 - Consider using medium-grade sandpaper for abrading your wood windows.
Mask the Glazing

To make sure of a hassle-free and efficient painting job, consider protecting the sash window from paint. This ensures your valuable time is saved by eliminating later paint removal through these steps.
- Start by using masking tape to cover the glass pane of the sash window.
- Be sure to leave approximately 1 mm of glass exposed around the edges.
TIP 4 - Overlap the final coat of paint by 1 mm for a watertight seal.
Give Your Windows a New Coat of Paint
To ensure a high-quality finish and protect the timber of your sash windows, use a bonding agent, a decorative and a finishing coat. Sash Window Refurbish recommend using Teknos primer. When painting, be cautious to avoid painting your glazing other than for the last overlapping coat which is about 1 mm of the glass. This overlapping technique helps protect the seal.
TIP 5 - Sash trim brushes make painting tight spaces and corners easier.
See also: Best Anti-Mould Paint
Additional Tips
To ensure a professional paint job for your sash windows, consider these additional recommendations:
- Prevent sticking. Avoid windows sticking when opening and closing by applying an even layer of paint to all parts of the window and following the correct painting order.
- Clean and lubricate. After the paint is dry, clean the casement gently with a detergent. This aids in maintaining the sliding mechanism and removes dust that landed on the surface while painting.
- Safety during exterior painting. Painting your window exterior is more challenging than the interior. Therefore, ensure to follow proper safety measures where possible, like using scaffolding.
- You shouldn’t worry about the glass. Suppose you accidentally get paint on the glass. Relax! It’s easily removable using a chemical paint scraper or even a razor blade.