The tank was really only good for around three takeoffs, and because the tank was pressurised by bleed air (while the system was armed), it was inconvenient and sometimes dangerous to open the tank to top it up during a hot refuel if you were doing repetitive tasks like fire bucketing.
And if you forgot to disarm the system after takeoff, the continual pressure in the tank could bleed the contents overboard, so you had nothing left when you needed it.
Ahhhh.... but remember that sweet smell when you stood downwind of an alcoholically-assisted takeoff. Better than being downwind of me after a night on the turps.
