How to Paint Your Sash Windows

Painting sash windows is a chore that most people have to undertake every five to eight years, depending on factors like the quality of the previous finish, exposure to the elements, and the condition of the frames themselves. You will know it’s time to repaint them when you notice the finish beginning to fade, blister, or crack. 

Sometimes, wood swells under layers of paint after moisture ingress. This is another sign that you need to refinish them or, if they are rotting, consider replacements. Some workmen and DIYers simply coat them as a cosmetic quick fix, but this will not last well and may make opening and closing your sash windows more difficult. 

In this article, we’ll provide advice on how to paint your sash windows and offer an alternative you’re sure to find very tempting indeed.  

A Quick Introduction to Sash Windows

Sash windows have a long history and reached their height of popularity in the Georgian, Victorian, and Edwardian eras. Thanks to their classic aesthetic, they are still popular today. They consist of sliding panels or “sashes,” usually composed of several panes of glass.

Although there are variations on the theme, they usually open by sliding vertically with the help of a mechanism of cords and counterbalances that are hidden in the frame. A more compact mechanism using spring balances is more commonly used in modern sash windows.

The Best Paint For Sash Windows

No matter what you are painting, choosing the right coating helps you achieve attractive and lasting results. The paint you choose must ward off damp, be UV-resistant, and flex as the frame expands and contracts with changing temperatures. 

Always check that the paint you choose was formulated for exterior use on a wood surface. This should ensure that your coating meets the requirements for a durable coating that will withstand weathering, at least for a few years. 

Acrylic paint will dry quickly and give you an easy-to-clean surface. For a longer-lasting result that is kinder to wooden frames, choose a microporous paint that allows the wood to breathe. This helps prevent wood from rotting, and the coating is longer-lasting. 

Your paint job will be as good as your surface preparation, so stock up on primer so that the top coat spreads smoothly and adheres better. You can do without primer when just recoating over (smooth) old paint, but if you do this with your sash windows, there is a strong chance you are sealing trouble in rather than solving a problem. Plus, extra layers of paint may prevent your window sashes from sliding over one another easily and smoothly. 

Steps For Painting Sash Windows

Painting sash windows is a much bigger job than painting casement windows. You will have to work carefully and thoroughly to get good results. Follow these steps to paint sash windows the right way.

Prepare

First, remove all window hardware. If any of your sashes are already stuck due to clumsy painting or paint buildup, use a utility knife to score along the obstruction. You will need to access all parts of the sash window. If you cannot do so, or it is difficult, consider removing the sashes completely as this will allow you to work more comfortably and thoroughly. 

Sanding

If the old paint is already peeling, you can scrape parts of it away before beginning to sand. Paint remover can be helpful, especially if you encounter multiple layers of paint. Now, sand the surfaces using medium-grit sandpaper followed by fine-grit sandpaper. Your aim is to remove all old paint and get down to bare, smooth wood. Be cautious when you sand towards the corners. You do not want to round them off. 

Priming

Make sure that you have removed all the dust from sanding before applying primer using a small paintbrush, or better yet, a sash brush that tapers for easier access into tight corners. It is important to get full coverage, so devote extra care to priming mouldings and joints. The primer must be left to dry completely before the next step: a light sanding to smooth off any imperfections.

Painting The Sashes and Frame

First, paint the sash rails using a small brush, applying the paint thinly and evenly. Work from top to bottom on the verticals. Move the sashes as you paint to prevent inadvertently painting the window shut. Now, paint the window frame starting at the top and working downward. 

To achieve a good finish, you may need two to three thin coats. Allow each coat to dry properly before applying the next one. During drying, move the sashes up and down from time to time to prevent sticking. Once you have finished, replace the window hardware and clean the glass panes. 

Tips for Painting Sash Windows

If you paint sashes without removing them, be extra careful not to paint the moving parts of the window shut. Painters’ tape is a huge help in keeping glass panes clean. Once it has dried, you can scrape away any stray paint with a sharp blade.

Of course, this is not a rainy-day job, and windy days can blow debris onto wet paint, where it sticks tenaciously, ruining your finish. Choose a mild, dry day and check the weather forecast before you begin. Factor in the time you need for each coat to dry in your planning, and remember to move the sashes from time to time to make sure nothing gets stuck. 

Not Up to The Job? Tired of Rotting Wood? Preserve The Heritage Look The Smart Way

Much as you love your sash windows, you may find the thought of having to paint them every five years or so rather daunting. There is no denying that it is a time-consuming task with many pitfalls for the inexperienced or unwary. 

Choose British-made sash windows from Stronghold Security doors, and solve the problem the smart way. Here’s how we do it:

• Our steel sash windows are clad with Medite Tricoya engineered timber that comes with a 50-year manufacturer's guarantee. 
• This natural-look wood requires minimal maintenance.
• We use a durable polyurethane coating for velvety-smooth finishes and supreme longevity.
• We offer a bespoke service that allows us to tailor our windows to your home and your preferences. 
• Security glass and high-quality locking systems, combined with sturdy construction, enhance your home’s security
• Our professional installers leave you with nothing to do but choose the look you want for your home - no more tiresome paint job - and no more worrying about rot and decay.

Most importantly, our windows live up to our name, turning your home into a stronghold that wards off intruders and keeps your family safe. Find out more about our elegant yet low-maintenance security sash windows today. They’ll save you more than just a Saturday or six spent sanding and painting! After all, peace of mind is priceless. Simply give us a call.

‍