Are you using micro applicator tips? You can find these at the hobby shop and they can give you better control. I have seen syringe type applicators, but have not tried them myself. You can also try using a medium CA instead of thin CA. I do most of my building with medium, and use the thin only when good wicking is required (such as hardening threads for screw holes).
If your plane is completely sheeted, you might want to try a fiberglass coat. Glassing is the preferred method of preparing the surface of a model for painting. There are a number of threads about glassing and where to get further info.

Hope this helps

Scott