Applying any material (Q-dope, epoxy, hot glue) to the wound toroid is not a
good idea. It increases the interwinding capacitance and can effect the
performance of the various toroidal transformers. This is especially true
in the transmitter section where the toroids are tuned with a fixed
capacitor to increase the power transfer. The value of these capacitors was
determined without any coating material on the toroid, and changing the
dielectric around the toroid windings may require a change in the
capacitor's value.
-John
KI6WX
Never have epoxied toroids, I can see one major
disadvantage using this method... You'd never be able
to rewind the same core. Epoxy is a real bear to
remove.
I've used hot glue to keep toroids in place, a little
easier to remove if needed.
Think you're better off with nail polish or acrylic..
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