Stripping Old Finish
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Inspect the window frames to assess the finish. If the frames have been coated with a varnish product in the past, the finish needs to be removed before the linseed oil can be applied. Apply a small drop of linseed oil on a spot on the window frame to see whether it penetrates. If the oil sinks in, chances are it has not been treated with a sealer.
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Move any furniture that is in front of the window and lay down the drop cloths when working indoors.
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Put on protective gloves to apply the stripper according to the directions on the can or jar. Many paint removers have toxic fumes and when working inside, open another window so that plenty of fresh air enters the room. Make sure you remove all the sealer by opening the window to apply the stripper to the bottom or side rail of the window.
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Use a scraper to remove the loosened finish. Wash the surface of the frame with a wet sponge or cloth. If you are working outside, you can use the hose to spray the stripping solution off the window frames.
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Let the cleaned and stripped window frames dry thoroughly.
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Use a fine sandpaper to prepare the surface of the wood for the linseed oil.
Applying Linseed Oil
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Sand the window frames lightly to disengage any embedded dirt or dust. Wipe off the dust with a damp cloth.
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Pour sufficient linseed oil into a container and use a brush or a rag to apply the linseed oil on the window frames. Let the oil soak in for a few minutes before wiping any remaining oil from the surface. Clean any linseed oil from the glass at the same time. You may need acetone to remove the linseed oil if it dries on the glass.
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Place all used rags and brushes in a pail of water when you are finished with them, even if you intend to throw them away. Linseed oil creates heat as it evaporates and if left to air-dry, the rags could create a fire. Let the applicators soak for a few days before throwing them away or cleaning for reuse.