Joel et al,
I didn't ask about the specific herbicide they used as "we" all typically use different stuff and dilutions, unless you are under State/Federal rules. They did mention " Garlon 3A" with a dye; however, I use (on my property) some stuff from Garlands and boost
the concentration depending upon the plant. When I read the article, I really thought it met a major requirement for me in dealing with my neighbors(hood) invasive plants spreading among my natives. I used to use a paint brush, still with collateral damage.
For those of you actually able to use herbicide on other property (City doesn't allow me), this would still be a great tool for cane type species, large leafy species (Yellow Flag), and possibly girdling a small/modest tree after abrading the trunk. In short,
invasives are winning; we need to pool knowledge; hence my memo.
Whether you can get this at our local hobby store, I don't know. I looked once and got lost in all their stuff. One of the kids, if they still do collage/pasted works, might know a similar tool. In short, I took someone else's work as a solution.
Regarding gloves, nitrile are better, and have more range for chemicals in general than latex. You can buy hundreds at Costco, or, Bimart has the better medical grade, and Glempers has even more material types, lengths, and thicknesses.
Jim