Duplicolor paints have the solvents right in the paint and they only dry by evaporation.
The clear coat that is factory applied is catalyzed so even if it gets no air it dries ROCK HARD. It is also impervious to most chemicals... I have sprayed easy off oven cleaner on a test panel and it didnt make a dent on teh clear coat! I was using DuPonts 7000 line of clear. It is "fairly" neutral in that you may be able to apply it over your duplicolor although it would have to go on in thin coats to prevent "crazing" of the existing Duplicolor paint. I would also let the Duplicolor CURE for about a couple of weeks before clearing them as it seals in everything under it and you can get a "soft" paintjob.
If you want to make sure your car does not "run" if you get chemicals on it make sure to go to a body shop to have them apply the clear. they may not guarantee thier work if they do not apply the color but IMO its a cheap peace of mind to know that you will have a rock solid paint job.
DuPont makes an 8000 clear which is used for transport trucks and heavy wear vehicles and is a VERY high strength, High solids clear which is so hard you can sit there and throw rocks at your car all afternoon and not damage the clear... on the other hand it will be very hard to buff it out as well!
