I have a large tree stump that I am going to polyurethane to preserve. The center of it is rotted.
I've dug out what I could of the rot with a shovel, drill, and vacuum.
Looking for advice on what I can do to remove the rest of the rot.
The size of the rotted area is about 1.5 ft diameter and 2' deep. The stump is 4 ft diameter.
I'm doing this to remove any moist material and give a surface that I can polyurethane.
An alternate method would be to pour something in the middle to preserve it but I don't know what that something would be. It's important that stump doesn't split under thermal cycling.
Any thoughts and advice appreciated.