Hi Chris,
You probably know this but maybe some other readers don't:
If you create such big shari or other big wounds on confiers and you do not want to use the regular wound sealants, petroleum jelly (Vaseline) is a good way to keep the inner wood from drying out too quickly, allowing the tree to seal of some of the veigns in the wood and bark before they dry out by the wind; This helps in healing and reduces die-back.