Right, wrong or other wise this is what I do when the balsa is fuel soaked.

I spray it down with denatured alcohol. Let it dry and do it again until you can see that all of the oil is gone. For a really wet, balsa it take three times. After the alcohol is dry I apply a coat or two of Balsa Rite. It comes in two formulas so make sure you get the one for film and not for coverite. The monacote will stick like crazt after the balsa rite.

Dru.