Hallo!
The secret to succed with K2R is to first soak the wood with aceton and then spray on K2R and then brush or use airpressure to blow away the dust....and repeting the process several times!
To set fire to such a delicate thing as a balsa airplane ,even for a short period of time , sounds
scary to say the least!

Regards!
Jan Karlsson
Sweden
Been into this hobby for 27 years!