RE: Fuel proofing and hinges
Those hinges will work just great as long as you install them properly.
The Thin CA will "wick" into them - Think of the wick in an oil lamp. You dip the wick into the oil and the oil defies gravity and climbs up the wick. CA Hinges work on the same principle.
When you apply a few drops of CA to the hinge, it will wick into the hinge and the hinge slot. You want to work quickly, but carefully - there's no need to rush. Just apply 5 drops to each hinge, then flip it over and apply 5 drops to the other side of each hinge.
Now, occasionally, you may get some glue that will travel along the gap between the aileron and the wing (Or the elevator and stab, etc ) This is no cause for alarm. You can just blow it out. If it spills onto the other side, it will wipe off with Acetone (or nail polish remover which usually contains acetone) and it won't hurt the covering.