Seem's nitromors isnt what it once was. Cyfa has a thread on here saying its changed and dosent work as well as it used to. Maybe time to find a new stripper (fnar fnar).
T'is true that nitromors has changed and is a lot poorer. I spent almost 6 hours last night stripping the paint from my frame with the new stuff. Have a look on ebay as there's people on there selling the old formula stuff which actually works!
Zip Strip. Best stuff on earth, just don't drink it. It's a strange gooey viscosity and goes on with a paint brush. Just paint it on, let it set a minute or 5 and wipe everything off. I always end up doing frames 1 tube at a time but can finish the job in an afternoon.