The thread lock is for screws that have metal to metal contact. I hleps to hold them in due to a lot of vibration that a Nitro puts out. Kinda like GLUEING the screws in. The 4 batts needed for the battery box are to power the electronics as the car is run from the nitro motor. As for fuel O'donnals is good and I always ran Sidewinder and never had problems. You would want to look for 20% nitro.

Good luck on deciding what road you want to drive down[8D]