Ok, if you do this, the best thing you can use the clean the varnish off something like a transformer lead before heat cure (after an hour or 2) is called Goof-Off. Magical product, its a few dollars for a tin with a very good squirt nozzle (like lighter fluid). I think it has THF in it, anyway it does a fantastic job of getting the varnish off of everything, including glassware on the final wipe after alot of mineral spirits, the plastic funnel (nalgene), small spots that the gloves missed, etc. It gets into tape real good.
If you soak it into a kim wipe or blue shop towel and gently pull it over the transformer leads it cleans right up.
I am going to do a bake now at 80C. I drizzled a little bit on top of the transformer because there was a slight cavity there, not sure how it formed, unless the stuff continued to flow inside of the transformer after a while of being out of the bath. I would probobly recommend if you care about cosmetics to do a 2nd standard dip after its cured if that works to make it look better, after a light sanding, but I don't think I will go that far until I test it and get a feel for if it works.
I did lose the transformer number, so be sure to write it down if you do this.
I used a large spaghetti pot for this, make sure its smooth onthe inside and the handle is welded to the outside instead of riveted on the inside. The lid I made from maybe 3/8 plexiglass with soft rubber glued around the rim, with silicone caulk at the interface of the rubber and plexiglass, the other parts are swagelok
I would highly recommend buying a vacuum chamber on ebay, everything but the plumbing is great on those, they have a real gasket, it can probobly pull a much harder vacuum. I put a normal glass beaker and used nalgene funnel and recycled the left over varnish back into the bottle, if it gets too tacky I will buy their varnish thinner and dilute it a little. If you 'fill' the area on top of the transformer where the windings are, it looks much better. When its dried and I handled it I think overall it is a better transformer, I feel more confident in the assembly.