I'm prepping my house exterior to paint soon. Part of the process is replacing rotten brick molding and sill nose on my POS windows. That was going fine until I got to a window where not only is the nose rotten, but the sill itself is partially rotten. I can't find a prefab sill that fits. Has anyone tried this: http://www.rotdoctor.com/house/Houtdoor.html or a similar product? What are your thoughts? I really don't want to try to fabricate a new sill from scratch!