Does chlorine trifluoride react with candlewax?
I don't think paraffin would last long, since PTFE doesn't seem to last in the presence of CTF.  From IGNITION! (John D. Clark), which you really, really need to read if you are interested in chlorine trifluoride or rocket propellents in general:


  The results were excellent, but the difficulties were infuriating.
  Ignition was beautiful —so smooth that it was like turning on a hose.
  Performance was high —very close to theoretical. And the reaction was
  so fast that you could burn it in a surprisingly small chamber. But.
  If your hardware was dirty, and there was a smear of oil or grease
  somewhere inside a feed line, said feed line would ignite and cleverly
  reduce itself to ashes. Gaskets and O-rings generally had to be of
  metal; no organic material could be restrained from ignition. Teflon
  would stand up under static conditions, but if the CTF flowed over it
  with any speed at all, it would erode away like so much sugar in hot
  water, even if it didn't ignite. So joints had to be welded whenever
  possible, and the welds had to be good. An enclosure of slag in the
  weld could react and touch off a fire without even trying. So the
  welds had to be made, and inspected and polished smooth and
  reinspected, and then all the plumbing had to be cleaned out and
  passivated before you dared put the CTF into the system. First there
  was a water flush, and the lines were blown dry with nitrogen. Then
  came one with ethylene trichloride to catch any traces of oil or
  grease, followed by another nitrogen blow-down. Then gaseous CTF was
  introduced into the system, and left there for some hours to catch
  anything the flushing might have missed, and then the liquid chlorine
  trifluoride could be let into the propellant lines.