I got a request to do a Boston Red Sox baseball cap cake for a coworker in a couple weeks. I searched the forums and gallery and noticed that a big problem for everyone was the brim of the cap. Since it has to made in advance to allow for drying time, the brim often appears to be a different shade of color once attached the the cake (body of the hat). My question is this....

Can I make and assemble the cake using white fondant/gumpaste and airbrush the navy blue color on once it's all assembled to make the color uniform?

Yes...you could mask of what you don't want blue if there is any other color....not familiar with their cap colors! Use light coats....let dry...then another coat until you get the depth of color you want.