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Ideally you should have pretty good vacuum. The idea behind the method I'm familiar with is you pump out the air while it's submerged in the sealer. Then when you let the air back in, the sealer if forced all the way in to the windings. If there's any significant amount of air, the sealer...

Right about vacuum. I have transformers and stator coils wound for products I make, and I specify vacuum impregnation of the coils. It's still done, and is necessary to get the sealer all the way through all the turns of the coils. The local motor rebuilding shop here has a vacuum chamber in...