The 2 guys I know that do professional bodywork swear by Dupont and won't use anything else. Personally, I don't know, but I have seen some of the ppaint jobs they have laid down and they say they always get a better result with Dupont. Maybe they are just more familiar with how it will respond under certain circumstances than others brands. my 2 cents
Spray what you are familiar with. If you havent used either than I would have to say Dupont chroma base is easier to mix, two parts to PPGs three parts. I have always used S/W or PPG but have sprayed the chroma base and it lays down pretty near the same.
I work at a body shop. i seen my brother spray every brand thats out there.To me they are all the same. i see no diffrents in the cheap and high$$$$ stuff. look at my car in the pic. i cant recall the name of the paint . but i was the cheapest paint out. the car was painted 7 years ago. its still holding up great today. oh yeah the car wasnt wet sand and buffed either!!
Dupont is known to spray thin and doesnt seem to cover as well takin more coats of base to get full coverage. With that said Dupont guys swear by Dupont...PPG guys swear by PPG...personally PPG is what i would use. Thats what we use in our shop and thats what will go on all my cars. As far as mixing you can get some 3M mixing cups that are made to make that task as simple as can be for any mixing you need to do.
I am a Controller for a Ford / Toyota dealership. We are a PPG shop. I was working at a Chevy Dealership before this one and they were a Dupont shop. Both are good products. I would go with what your painter likes.
I painted my Red 39 Ford Coupe 18 years ago with PPG DAU 82 base and clear. It has alway been garaged, but the paint has really held up nice. A lacquer job would have cracked and split off by now.
The Dupont goes not cover as well with its base vs PPG. Step up and buy the best clear coat. Money well spent. Both of these dealerships put out nice work.
The key to commercial body work is the ability to match the factory paint. Both PPG and Dupont mix stations will effectively match factory paint. This is not as much an issue with overall restoration/custom paint.
My preferance is PPG because my 1939 Coupe really looks nice after a 18 year garage appiled home paint job.