The word "lacquer" coupled to "pickup" gives me the chills , yet there is something to it.
To begin with, transformers and motor windings *are* potted in something close to lacquer, but itīs actually either "transformer varnish/enamel" or potting Epoxy , which can either be air dry or oven dry types.
In a pinch, I have successfully potted transformers in plin household "marine Varnish" and even in home type oil/synthetic paint (colour is irrelevant and doesnīt hurt anyway)
We are talking paints, varnishes or enamel which dissolve in turpentine or similar, which is "oily" and does not attack plastics.
Now the word "lacquer" makes me think of old car pint, dissolved in strong thinner, which attacks plastics and most wire coatings, specially modern ones, so itīs dangerous useless on ickups.
One problem with the "strong" varnishes, even worse with Epoxy, is that they become solid forever, pickup becomes disposable, while itīs easy to remove a wax potted winding, wipe bobbin clean with a plain piece of cloth, no need for solvents, and rewind it.