That’s the reason I’m posting on here! That SBK has yet to work, despite the fact I increased the ratio to double strength!!!
It’s not a quick process. I removed some from a couple of walls on my sisters house.
The stump was 8” diameter and it took over 6 months for it to die above ground. It just went brown and was stuck like the proverbial to a blanket.
Doubling the strength won’t do much.