I started out my painting career with DuPont. I've had some weird issues with it, but over all it's an ok product. I've seen that issue with the paint pealing right off the primer and was told by a Dupont Tech that you have to use a sealer they make that stays tacky for a couple days. If you lay it down smooth, you can top coat it in 10-15 minutes and it's suppose to have a great bond.
I've had major problems with Dupont's clear, silver, and their jamming clear. I have had the silver sag under the 7500s clear, and I've seen their silver look lumpy. I'm not the only person with this issue 'cause I went to a Hot Rod show and there was a Dupont display with some gastank shells painting in custom designs. The one painted silver had an orange peel texture in the paint. Two other issues I've experienced, or hear about with Dupont is the colors are sort of muddy compare to HoK & or PPG's Global line (example: Dupont white isn't has brillant as HoK's white, or the yellow isn't has vibrant etc etc.). The other issue I've heard about is that Dupont's paint laysdown thicker than HoK, PPG's etc. This works for you and against you. I've had Dupont's paint cover quickly in some flames in where HoK took lots of layers and time to get opaque. I felt more of an edge on Dupont's paint and that takes more clear to burry. I have sprayed some thin coats Dupont yellow into some flames and then top coated with HoK Lemon yellow to get a very vibrant color in a short time frame.
The BIG deal with HoK is their vibrant colors and they're mainly used for the World of custom painting. That's why they are mentioned frequently. I've seen a lot of top painters use both HoK and another BIG name automotive paint brand together to achieve the results they want.
If I have a customer come in wanting a specific color, or color match I usually run down to the local Dupont paint store and get it mixed. They get it dead on, the job gets done & the customer is happy.
The main thing that pulled me away from using Dupont was the price of their product. I can get HoK much cheaper, even when the Dupont store orders it for me.
Currently i'm checking out Valspar, but can't tell you much about their product now. If there's any feedback about Valspar post away!