Or has this one rotten apple spoiled the entire bushel, resulting in the “heave-ho” for the window itself? I know I’ve defined my working area when I’ve reached well-bonded paint around the entire perimeter. Wood rot can be like an iceberg in some ways. Once you’re satisfied that the surface rot is cleared and still contained to within the 10 percent margin, test the wood for remaining moisture. Insert the tip into each drilled hole and squeeze the mixture until it runs from the wood surface.