Make new wounds in the stump if it is not freshly cut.
Protect yourself with safety equipment and gloves.
Use a paintbrush to carefully apply the herbicide to the surface of the stump.
Dispose of application tools safely.
The stump should absorb the herbicide and cease to be viable within a few days.
Remember that while herbicides offer a quick fix, they also carry the risk of environmental harm and should be used responsibly. Always follow local regulations regarding grubbing and consider the environmental impact of your chosen method.