True K2R is safer but with the knowledge that my firewall and
formers will not depart from the fuselage in mid flight due to fuel
soaked balsa , I would wholey suggest that the burning acetone
method totally removes the oil from the balsa much better than K2R which leaves an oily residue behind.If you don't believe me try this method.I have told all my friends about this method and they all think it works a treat.
happy flying !