I have used plastic electrical tie wraps for many years. Field repairs included. Main use is for holding tanks on profiles. As long as you have something soft between the tank and fuselage, then the ties themselves, don't seem to transmit much vibration. Mind you profiles are a can of worms for vibrating fuel tanks. I have used them on Peacemakers and Flite Streak type models, with no problems.
  Makes me wonder why people persevere with profiles. They usually finish up more expensive, weighty and far less rigid than a simple full fuselage model. There isn't much in the way of time saving either! But each to their own.

Regards,

Andrew.

I've always used silicone, like Dow bathtub sealer to secure fuel tanks.  It's perfectly fuel proof and has a bit of resiliency. 

Its not proof against diesel fuel, in fact if anyone wants to remove silicon glue then just use kerosene and watch it turn to jelly before your eyes.