Powder coating gun suggestion

So I got the gun today, hooked up the oil/water filter and regulator.

How do I do the ground? I read the instructions and it calls to sink an eight foot copper rod into the ground and connect the clamp coming from the power supply to that. And then a 14 gauge wire from the grounding rod to the workpiece.

What do you guys do for grounding when Powdercoating?

Thanks.