There is a better way to solving this issue. Do it before it becomes a problem.
When building a new model consider the areas that are most likely to be prone to fuel soak.
From my experience that goes from the nose to the point of the fuselage that is at the rear of the trailing edge of the wing.
While the fuselage is in the built up but uncovered stage paint the wood inside and out with a mix of two pot epoxy resin that has been thinned about 3-4 to one with methylated spirits. Apply 2-3 coats, one coat each day, and allow to harden. Sand lightly between coats then cover/paint as you wish.
This will give a fully fuel proofed fuselage that will last a life time.
"Trust me, I know what I'm doing..... " famous quote from Sledgehammer.
Seriously though, I have models that are nearing 20 years old and they still look as if they just rolled off the building board.