LAST EDITED ON Jan-13-04 AT 10:42 AM (CDT) Hi Paul,
Sounds great that your son is interested, and keep him that way.

As for the dope. Since it is an all wood structure, a trainer, and a "project" to learn on, I would get the following:
(1) pint Balsa Filler; just brush it on the wood and sand it smooth.
(1) pint White; paint the whole plane white first to give a uniform
color to the trim coats.
(1) 8 oz. can red
(1) 4 oz. bottle black
(1) Quart Clear
(1) Quart Thinner
All this may sound like a "lot", but any that is left over will be used on the next project.
1. Put about 4 coats of clear on first, sanding lightly after the second, and subsequent coats.
2. Put on a couple coats of filler, sanding after each.
3. Put on two to three coats of white, wet sanding with 600 after the first coat then 800-1000 after the second. The third coat should be nice.
4. Put on the red. Maybe two coats will be needed.
5. Black, probably will need only one coat.
6. Clear overcoat as needed.
This should give you a nice finish, not very heavy, and will be practice for the coming projects.
All dope should be thinned. (Sig gives directions for thinning for brush use, I think Bridak does, too)
I would get all Brodak (or Sig) to keep everything compatable.
A very nice finish can be done with a brush!
Not as complicated as it sounds, not a front row finish, but very serviceable and should look nice.
Bill <><
EDIT: Bob's finish will work, too. Talc can be substituted for corn starch, and the rustoleum will be quicker as well as looking good.