Aircraft stripper works great if you follow directions when applying it, covering it with plastic sheet helps to get faster and better results

I used circa 1850 and had no problems.

used aircraft stripper and as was said factory primer was the only layer that did not lift.

Methylene Chloride works ok and so does MEK (methyl ethyl keytone) which can be bought at the local paint store (very dangerous stuff to breathe)... but all this stuff flashes off very quickly which is why aircraft stripper comes in a gel form.

Although aircraft stripper works better on most paints, I've had good luck with heavy duty easy off oven cleaner with some paints that were stubborn....and when all else fails, there's always brake fluid