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Q.

How to Varnish Window Sills?

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0 2025-09-12T16:59:08+00:00

In my home, I have wooden windows that are five years old and never painted. To protect them from moisture, I decided to varnish the window sills and hired a painter. While he worked, I watched carefully to learn how to varnish window sills. He followed the process carefully, fixing old damage and preparing the surface. I have shared a detailed process below.

How to Varnishing Window Sills?

  1. First, he checked for any damage and decided what needed to be fixed, as it can be different in every situation. 

  2. He then taped off the areas to protect them and laid bags on the floor to avoid paint or dust. 

  3. Next, he sanded the sill until it was smooth, applied a stain and sealer to the trim, and then applied varnish to protect the wood and give it a shiny finish. 

  4. Finally, he painted the trim with an angled brush. It looked fresh and perfect.

In the end, the window sills looked smooth, shiny, and perfect. This is the proper way to varnish window sills. Hope this helps you.

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0 2024-09-19T20:12:35+00:00

There was a time I was searching for how to varnish window sills. I recently had to do the activity, and I must say, it was a big task and required my efforts, but so worth it in the end. I made a note of how to do it step by step and ensured perfection. 

What is the Process of Varnishing Window Sills?

If you’re thinking about doing it yourself, here’s how I went about it, and it made a huge difference:

  • First, I removed the old varnish using a carbide scraper. I think it’s important to always scrape in the direction of the wood grain, so I don’t damage the wood. 

  • Then, I sanded the surface with three different sandpapers: I started with an 80 grit, moved to 120, and finished with 180 to make the surface super smooth and ready for varnishing.

  • Since my sills had black stains, I also treated them. I used a wood cleaner and scrubbed the stains away with a stiff brush. Afterward, I wiped everything down with white spirits to clean dust.

  • Next came the first coat of varnish. I used Dulux Sadolin Synthetic Clear Varnish because it’s great at sealing the wood against the elements. 

  • After it dried, I noticed some fine hairs on the surface, so I gave it a light sanding with 240 grit paper before cleaning again with white spirits.

  • Finally, I applied two topcoats of Dulux Sadolin Wood Stains, and let each coat dry for about a day in between.

The result was amazing. The sills now look brand new, and the wood has that rich, polished look again. I hope my answer gave you the motivation to give a rich look to your sills too. 

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How to Paint Wood Windows Interior?

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