If no KR2, then try making a mixture of corn starch and isopropanol. Make it into a thick paste. Brush it on, and let it dry to a powder--wipe off the powder, and continue the process until dry. Works great!

Also, in ARF's, it's YOUR responsibility to fuel proof it. Since it was a trainer, and probably your first ARF, then you probably didn't know that. Very few ARF's will come fuel proofed. Just a little tip for later on...