James Waldby fired this volley in
:

One light coating of polyurethane on your wire probably would
be good enough. Have you thought about hanging the wire
between two well-separated trees outdoors and painting it with
a roller? Didn't think so. But seriously, if you string
the wire back and forth 10 or 20 times between two headers 40'
apart, it would be quite fast to paint it all with a roller.


It's a lot easier than that. The old Fordson spark coils of tractor
mythology/fame used "stove pipe wire" for the core.

The trick is to anneal the wire in a slightly oxidizing fire (basicall,
"blue" it). The oxide coating is not significantly conductive. And for
what it's worth, the more thoroughly annealed the wire is, the greater
the permability and the higher the saturation current of the transformer
will be. Of course, the alloy plays a great part in this, with high-
silicon steels being good in this respect.

LLoyd