Does the rustoleum need anything else with it. Is it sprayed or brushed? Is it fuel proof?
Only the Rustoleum Gloss Protective Enamel in non-metallic colors is fuel proof. But if you give it a couple of weeks to cure out, the Gloss Protective Enamel is good stuff. Unfortunately, most of the "finishing" systems that are recommended for Rustoleum involve lower layers that
aren't fuel proof -- I've been finding that the areas under my fuel tanks (on profile models) tend to get a little wrinkled, and dings and dents in the front of the model tend to get wrinkled patches around them. That's not too much of an issue for me -- I go through airplanes pretty quick -- but it's a strike against Rustoleum if you don't.
If you take
Flying Models, dig out the May or June (I think) 2010 (I'm sure) issue -- look for an article titled "finishing the Oriental" by Allen Brickhaus. It details the whole bare wood (and bare 'coat) to Rustoleum process.
You can also do a search here on "Rustoleum", perhaps along with "Polycrylic" and come up with a lot of info.
You probably want to spray the Rustoleum with rattle-cans, but if you have the equipment you can buy the brush-on stuff, thin it with acetone, and spray it with a spray gun. I can't imagine being able to brush it on and have it look nice without weighing a ton.
I once mentioned that I just spray Rustoleum straight onto 'coat, without scuffing it, backed by the fact that Mr. Brickhaus didn't say anything about that in his article, and got scolded (Hi Dan). It's true -- after about six months, your Rustoleum over unscuffed 'coat will start to chip slightly. I tend to solve this problem by crashing my planes before then -- the big square patches, the rips, and the scuff marks as big as Texas do tend to draw the eye away from the minuscule chips. Scuff things anyway.