If you run tubes you better also screw the tires to rim when you have some power in the motor.
I ran a couple of runs with QTP's but since I didn't want to drill my steel wheels I ran them tubeless.
Did have a bit of trouble of getting them to seal on the wheelbeads, so I layed down a bead of silicon-rubber in the wheels before mounting them.

This is what had happened after just one run, look at the marks...





Eventually the silicon started to wad up in the beads causing a small leak themselves again.
So don't do as I did