Shellac was the "Old Timers" preferred coating for coils and transformers.
I personally still use it for coils.

KF4HAZ - Lonnie

----- From: "Bob Blick" <bblick@

> Milosz K writes:
> 
> >  I'm taking on a personal project that is going to envolve tinkering
> > with power transformers. I plan on doing my own custom winding of the
> > secondary. Does anyone have a cheap substitute for transformer
> > varnish? Maybe something from the hardware store???
> 
> Hi Milosz,
> 
> I've used linseed oil, but most linseed oil takes a long time to dry.
> 
> Cheerful regards,
> 
> Bob
> 
> 
> -- 

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