What method do you have to hold and spray paint small parts?
Items such as engine cowls, wheel pants, rudders, horizontal elevators and flaps are painted prior to assembly on the aircraft. These parts are difficult to hold and spray paint.
t michael jennings 
Michael,
There are a lot of good brains to pick on this forum, and one of the best is Randy Powell's. Randy showed his manner of holding small parts for painted, I tried it, and it works great.
Mine are slightly different from his, but you can modify things to suit your own needs. The base for mine is some 1/2" X 1" stock, with a cross piece glued on so that the holder will stand on its own, and a hook-eye in the end for hanging on the drying rack.
For the control surfaces, cut pieces of 1/32" ply the same width as your hinges, and a couple of inches long, and put two of them in your control surface, and THEN with a large staple gun, staple the plywood to the base. Each holder has to be custom made to fit each different control surface, because no two are ever the same. But you can keep one piece of plywood in place, and move the second one as needed for future projects.
As far as the cowl is concerned, each job is a little different. You should be able to use the mounting brackets, and make a simple custom jig to hold the cowl.
Save all the holders that you make, because they can be modified to work with future builds, and a lot of time time will be saved.
These holders do make life a lot easier when painting. You can prepare each part, mount it on a holder, do the final clean, and then hang them up in preparation for painting. As you paint, you can take each one down, one at a time, do your spraying, and hang them up again to dry.
Great idea.....thanks, Randy !! (See...we are paying attention) :-)
Cheers,
Warren