I just had a new fence installed and the workers took it upon themselves to take a large chunk out of my neighbor's tree in order to keep our fence line straight (which, it isn't, by the way). I am concerned about the tree because we had another tree taken down and the arborist told us that to grind the stump of the damaged tree alone would be $1200... so I am very interested in keeping the tree healthy right now. Is there a product that I can purchase to seal the exposed trunk in order to prevent decay and damage to the tree from insects, etc? Any advice would be appreciated. Thanks!