Peery:
As the old wise forester once said, "Trees don't heal, they seal their wounds." With that said, resist the urge to apply tree paint/sealants, concrete, or sheet metal to wounded trees. In fact, most tree sealants interfere with natural “sealing” processes. In most cases, trees will compartmentalize the wound naturally.
Your best strategy is to maintain the health and vigor of your tree through proper maintenance, watering, and fertilization. As a friendly reminder, try to avoid mechanical damage (e.g., lawn mowers, vehicles, tractors and equipment, etc.) and excess mulch around the base of your trees. As long as your tree appears healthy, has a full crown of green foliage and no signs of serious internal rot or insect activity, then I really wouldn’t worry too much about trying to help your tree “heal”.
However, I would highly recommend contacting a certified arborist or tree care service if you suspect your tree’s health and vigor is in decline.
Best of luck!
