In current issue of Model Aviation,  Bob Hunt writes about using Dupont Chroma Base for color coats and clear coat on his Crossfire Extreme.   When talking about mixing the trim colors he mentions that there is no catalyst or hardner used, only reducer.  He also mentions that it "air dries".   I was under the impression that all coats in a basecoat/clearcoat system used a catalyst and cured by chemical reaction.  So was I just mistaken about that, or is the ChromaBase product something different from a typical 2-part auto finishing product ?

I dearly LOVE the Dupont Chromabase/Chromaclear system!  It takes so, much less paint!  For the mint green I used on my Argus I mixed up 5 oz (including reducer).  Had paint left and  it covered completely plus it dried in minutes.  DO NOT put any dope product over the basecoat, it will eat it right now.  But dope (for repairs) WILL go over the clearcoat.  That way I can use the system and silkspan for covering and still be able to patch any holes.

BIG Bear
RNMM/AMM

Allen,
without going into a complex chemical explenation ( shich I dont think I could do effectivly anyway) simple answer, it just works,, Lacquer is an ancient technology material, this base clear system is fairly new and as such is much more advanced.
Trust me, blush is not an issue in anyway.
You are correct however in assuming that the thinner is basically a solvent , however there are many parts to the solvent, one gets the material to the proper viscocity to leave the gun, one gets the material to flow on the surface and yet another keeps the surface open to allow the trapped solvents to escape,, it is far more "engineered" than lacquer ever thought of being,, it works,

I wish I could give you a better technical explanation, but I don't have one,, and I did not think you were doubting, I understood you were just trying to understand why,,

personally I recomend a proper respirator when spraying ANY material. so YES