This is a common question. For a number of years, the use of tree paint or sealant was not just recommended; it was considered the gold standard of tree care. Professionals and diligent homeowners alike would paint branch stubs after making cuts or pruning.
Like many of the sciences, tree science has evolved over the years. What we once thought was beneficial is now considered of no benefit, or even harmful. Wound sealant is now considered harmful, potentially contributing to fungal infection and weakening of a tree's immune response.
So the answer is that tree paint or wound sealant should not be used.
Want to learn more? Read about why wound dressings are harmful to