You want to do a fair contest and have the rotary skills judged? EASY! (kinda) Buy some aluminum cookie sheets (about $6 at a commercial restaurant supply store). Jason and I used them at our NXTti classes. I bought 24 of them and had the local college paint them for me:
Paint them black, use a quality automotive paint, and have them all done at the same time. This way everyone is working on very similar panels. Send them out to the autopians that wish to be in the contest. Just count the cost of the pan, paint, & shipping (to and fro) as an entry fee.
Take them to the detail convention in Florida (January), and have the panels judged there by convention-goers. Just ID the panels using a code on the back of the pan.
There will be companies there that have access to gloss and surface topography meters (I think Mirka and Meguiar's have them). I suspect other companies would, too. Maybe a few reps could sponsor this deal (or a sponsor on autopia!).
Score the panels in three categories. 1. Base this score on the readings of the topography meter (showing peaks and valleys). 2. Base this score on the gloss meter readings (accurate light reflection). 3. Base this score on spectators choice (the panel with the most votes gets the highest points, and so on down the line). Add it all up and the highest score wins!
Ship the panels in a cardboard box. The pan would need to be supported by the rolled edge (along the sides or at the corners), to avoid any surface marring caused by plastic, paper, shipping peanuts, etc. Freshly painted cut & polished panels still need to outgas, and anything that sets upon the surface would leave its 'footprint'. The panel would have plenty of space surrounding it to protect it during shipping.
The only thing I don't know for sure is if the trapped outgassing would pool upon the panel surface (on a micro level, I know...), or have an affect on it.
Once set out for display, the panels should be final-wiped using the highest grade mocrofiber towel and an IPA wipedown.
I don't think rotary should be the only way to finish, though. Since there's no way to know what was used to finish the panels, it's wise to just judge the panel based upon the scoring parameters.
Ta-Da! :xyxthumbs