How to Sand and Re Varnish Wooden Window Frames and Doors


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Are your exterior wooden windows looking dull and weathered? It’s time to spruce them up with a fresh coat of varnish! Regular maintenance of wooden windows with a light sanding and a new coat of varnish or stain every year or two can protect them from the elements and keep them looking great. If you’re wondering how to sand and revarnish wooden window frames and doors, read on for our six-step guide.

Begin by removing the old coat of varnish with a carbide scraper, working in the direction of the grain. Check out these clips for a visual guide.

Once the old varnish is removed, sand the wooden window frames with medium-grade sandpaper. Repeat the process with a finer sandpaper, starting with 80 grit and moving up to 120 grit and 180 grit.

If there are black stains on your wooden windows, treat them with a wood bleach such as Net-Rol wood cleaner, scrubbing with a stiff bristle brush until the stains disappear.

Clean the wood with white spirits on a rag, then apply the first coat of wood protection. We recommend using a product like Sadolin Classic wood protection, which will seep into the bare wood and offer excellent protection against the elements.

Once the first coat has dried, remove any tiny hairs that have risen to the surface by sanding with a low-grit paper, such as 240 grit. Clean the wood again with white spirits.

Apply the top coats of wood stain or varnish. For a durable finish, we recommend two coats of Sadolin Extra Durable Wood stain. Apply one coat and let it dry, then apply another coat for the finish.

If you’d rather leave this job to the professionals, we offer window frame sanding and revarnishing services at Paintingincolour. Contact us for a quote today!

Don’t let your wooden windows go another year without proper maintenance. Follow our guide for sanding and revarnishing wooden window frames and doors to achieve a beautiful, protected finish.


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