Hi,
I am not sure whether they have changed the formula of Nitromors, or what type of paint you have on your machine, but in the past I have used it with a metal scrapper & and completely stripped a frame albeit with a fair amount of elbow grease, then used fine emery to finish.
It perhaps took 3 goes to strip everything, you have to do it of course, in an well ventilated area & I was lucky in that I never smoked so, I was not in any imminent danger of turning myself into a protesting Buddhist monk scenario!
Cheers
JBW