Kat,
The fastest way I have found to strip Quantum Tube is to use Acetone. I know what you are going to say...it will damage the tube! You are right about that, but I have several coats of primer on my rocket and the paint strips like a dream to reveal the primer. Use paper towels so you can get a fresh towel if needed and it will strip fast! Once you are down to the primer...wipe it down with Denatured Alcohol...it will clean the "stickyness" that may be left on the primer from the Acetone. Also, when you get to the end of the tube, switch to Denatured Alcohol...in case some runs down the tube while stripping the end, it wont be damaged.
I have done this successfuly with two different rockets using Quantum tubing and have never damaged a tube.
Good luck bro!
Carl