Before you price out a full window replacement, take a breath. For localized rot—where the damage hasn’t reached the interior wall or destroyed the structural integrity of the frame— isn’t just a patch. It’s a resurrection.
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Here’s everything you need to know about selecting, applying, and finishing wood filler to make a rotted window sill last another decade or more. Let’s clear up a major misconception. The water-based vinyl spackle or the one-part wood putty you use on interior baseboards? Do not use it outside. wood filler for rotted window sill