interesting that the Mac coils do not get dipped. they must use tape between layers to prevent vibration.
that tar will not get very far into the winds,
i use to stack cores, a machine would cut strips off the rolls of 29gaM6, anywhere from 1 1/2" (what a pain) to 12", a magnet would hold it to the top of the conveyor belts, every three chunks would trip a stop to come down which would also trip after three chunks and drop it onto the other three chunks that were situated up stream, then you would slide the table over to another table which was used to band the core together.
there you would use two buzzer contraptions to vibrate the steel together til it had a gap the same width as the size steel you were cutting. if you went to far then you would have to pull the lams apart 3 at a time, what a pain, so you vibrated the legs together leaving about 1/16" of spare room just in case, this gap would get hammered shut by the coil/core assy person with a core tool made out of non hardened steel.
one time i went outside to get some fresh air while my core machine was running. the dereeler lever got stuck in the on position, so when i come back in, there is a big pile of transformer iron looking like film from a projector that had unraveled on the cutting room floor, so i had to manually feed it into the machine before the boss showed up, never left the machine after that, some joker would sneak up and hold the lever on when i was not looking,
a lot of the equipment in the transformer shop is hand made, the most ingenious piece of equipment i saw was the little core stacking tool for hand stacking 3 x 3 cores of medium size, somehow, the magnet made the lams walk up a stainless steel plate where you could easily feel 3 lams, after a while you could pick 3 lams by feel without looking and stack them on a rack in rapid fashion,
still do not know why it worked, or who figured it out, but it looks like this>
