My experience with trying to apply Monokote over paint was not good. The Monokote stuck to the paint, but the heat softened the paint & it was impossible to get the Monokote to shrink with out getting it to pucker. Another option would be to sand down what you have & try repainting over what is allready there, either directly or primeing & then painting. Its difficult to help without knowing in more detail what type of paint was applied originally. Keep in mind the more paint you apply the heavier its going to get, and well you know the rest of that story. Good luck, hope you get something figured out & get her back in the air...Gene