I know this but isn't an arborist forum but there's a lot of knowledge here so thought I'd ask. This street oak was hit by lightening a couple of years ago. I was advised at that time to just wait and see if the tree lived. It seems to have survived but there is progressing damage in the open wounds. The damage is rot caused by moisture and insects. I've cleaned out a lot of the damaged wood but fear continued future deterioration if the wounds are left open. My idea ways to complete clean out of remaining rot and spray the open areas with insecticide. After the areas were thoroughly dry, seal with something. Paint? Expanding foam? Suggestions? Is this just a bad idea? I hate the thought of having it removed but don't want it falling on my house for sure. Thanks, Mike