A palm-like tree (likely a Dracaena or Yucca) hit the ceiling. Previous cuts had black tar-like sealant. Owner asked about re-cutting and sealing.
The black substance is pruning sealant—prevents bacterial/fungal entry. Not absolutely required but good insurance. Available at garden centers (Lowe's, Home Depot, Walmart) in swab-top cans.
Simple, safe, and effective for height control.
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