Wrong DA?

The first two shops I worked in used PPG, so I've used a bunch of DP40. I haven't used any of the DP40LF (lead free) but it seem that people don't like it nearly as well as the old stuff. I've been using the SPI epoxy on my own projects and really like it.
I'm wondering if it will hold up after 10 years. It's seems that all the new primers and paint are getting better but I still worry about the base. I try to get my bondo and bare metal in 180 grit because I don't like using a ton of primer. I think the better you get the bondo straight the less primer you need. and less blocking and priming and blocking and priming.