I ran across this product recently. Here is a clip from a website:

\"HORTICULTURAL GLUE AND BARRIER PAINTS - These products are applied to the trunks of trees to prevent insects making their way up into the foliage canopy. They are particularly effective against ants, preventing them transporting scale, aphids and other insects from overcrowded colonies located nearby to clean plants. They can act as effective barriers to a range of caterpillars.\"

Has anyone tried this? Is it safe? Effective?

Thanks in advance.

Robert