Quoted from ita47:
What type of Lacquer should I use? I have been searching the web but haven't found much. The one pinballnreno referenced comes in a 2oz. bottle and is red.
I know that manufacturers of guitar pickups dip their windings in some sort of wax. Beyond that, I have no idea. I do know that bee's wax has a high melting point. So it might work for an electronic dip. Don't know if it would contain or stop any stray voltage. But liquid bee's wax would flow into every crack and crevice.
Here is something I found on making guitar pickups. Will it apply to making transformers? I don't know, but this might give some useful info.
Potting or saturating a pickup with wax is done to help keep the wires in the coil in place and prevent the pickup from becoming microphonic.
I used Gulf Wax (candle wax) to saturate my pickup because it was available, but you could also use a mixture of 80% candle wax and 20% beeswax.
Melting the wax directly on top of a heat source, in a saucepan on the stove, for example, can overheat the wax and cause it to become highly flammable. And we do not want to lose our eyebrows while making guitar pickups do we? NO! So, to melt the wax, I filled a big container about half full of almost boiling water and placed a smaller container inside. A tin can works transfers the heat from the water to the wax more effectively, so use one if you have one handy. Gulf wax comes in blocks, which don't melt very quickly, so I used a knife to break the wax into smaller pieces. Then I put this wax in the smaller container.
When the wax is completely melted, hold your pickup by the lead wires and submerse it in the wax. You will see bubbles coming out of the coil and you need to leave the pickup in the wax until the bubbles stop. For me this seemed to be about 5-10 minutes, but for you it could be longer.
Take the pickup out of the wax and wipe of the excess while it's still in a liquid form.