Hmmm!
Didn't think it was necessary to get into this as PTFE is practically the industry standard, except for special cables used in aerospace and naval shipbuilding (my direct background experience).
All the recommended types most probably have PTFE insulation and all used stranded copper wire to improve current carrying capacity and reduce losses.
I never had any sweat stripping PTFE, been using the tool in the photo for donkey's years with ease. Adjustable for all sizes we are likely to need; grip, twist and pull and you're done!
In emergency I have also 'carefully' used small (sharp!) side cutters or the ubiquitous Swiss Army Knife - no problem.
Can't recommend using varnished CW like that, not what it's meant for. As you say solenoids,
transformer
s, not to mention inductances for various circuits (including the all pervading solar garden lights, ever wondered how they make a 2V LED work on a 1.2V NiMH? Oscillation and inductance!) and of course E Motors! I
On the electrical side: A single wire like this will have less current carrying capacity and warm up more than a stranded wire of the same diameter. Skin effects and so on! the warmth is wasting energy you want in the motor.
On the practical side: A messy and time consuming business, and what happens when you want / need to mod something? Tear the ship apart? Not surprised you have never done it! Don't even want to think about what happens if the wire gets hot inside an epoxy jacket ๐ก
Also, before your can solder it you have to burn off the varnish, which produces toxic smoke so you have to work outside (!) or in front of an extractor / filter, as I do. 'Every home should have one' ๐
But I only use TCW or varnished CW for fixed links on circuit breadboards and test jigs. Or sometimes for detailing on models; railings, ladders, masts, scale antennas etc. Very good for the Yagi antennas of the first generation naval radars etc. ๐
Hope this clarifies and helps the novices to cut the wheat from the chaff.
Happy modelling ๐