Your device is probably a much better way than I did it as a kid.
I used to wrap a coper wire around a bottle then connect it to a 12volt lantern battery the wire heated up the bottle snapped in two. Sometimes nice and clean but sometimes the cut would be uneven due to the wire not being straight
Never try to tell me it can't be done
When I have to paint I use http://kbs.justoldtrucks.com/
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