The varnish protecting the woodwork all around your window doesn’t last forever. Sunlight and moisture degrade the finish over time, and also the window has to be re-varnished to prevent harm.
A Fresh Look
Prior to working on the inside, inspect the exterior woodwork for almost any chinks in the glaze or seal across the glass or damage to the woodwork that would allow moisture to seep through to the inside. Make any necessary repairs to avoid damage to your newly refinished interior. Remove the sashes, if possible, and then re-varnish them separately. Lightly sand the inside woodwork if it is in good shape. Alternatively, strip it if the end is cracking and peeling. Apply at least 2 thin coats of varnish using a high-quality, natural-bristle brush. Sand between every coat, using fine-grit sandpaper. Sand or strip the woodwork on the sashes as vital. Apply a narrow bead of clear caulk into the sashes along the seam between the glass and the timber. When the caulk is dry, then apply at least 2 coats of varnish to the sash, sanding between coats. When applying the masonry, brush upward on the vertical surfaces and use a little crisscross pattern on flat ones, finishing using long, even strokes.
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