Don't mind that name--that's just what I'm calling the stuff. The stuff being what a guy would want to use to fix a rotted window frame.
I've seen this stuff, both on the tube and in the flesh: a putty that dries hard and white, and is perfect for the repair I need to do. I have a window sash with a rotted-out corner, maybe 3-4" of wood gone completely. My plan is to clean out all the rot, embed some metal in the corner and use this stuff to rebuild the frame. Even thinking of making a small silicone mold for the window-stop profile to replicate it.
Anyone know what this stuff is, and where to get it? I'm pretty sure it's some kind of epoxy with fillers added. Probably not cheap, either.