Painting or sealing a fresh pruning cut looks like it should protect a tree, but decades of research show it usually does the opposite.
Trees don't heal wounds the way people do. They wall off damaged wood from the inside and grow new tissue over the cut from the edges. Sealants can trap moisture against the wood, create a good environment for decay fungi, and slow that natural closing process.
The better protection is a clean cut made in the right place, just outside the branch collar, so the tree can do what it's built to do.
There are rare exceptions, such as certain oak wilt situations where a light coating helps keep beetles away from fresh wounds during high-risk months. Weighing details like that on each job is part of what an ISA Certified Arborist brings to pruning work in Southwest Pennsylvania.
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A real close-up from an STS job of a clean pruning cut just outside the branch collar, ideally one showing a healthy ring of callus closing over it. A side-by-side with a painted cut would also work. Authentic photos far outperform stock images.
Canva text suggestion: "Skip the Paint, Make the Right Cut" or "Trees Seal Their Own Wounds"