I'll attempt to answer some of your questions, based on my experience with PPG products..
1.,2., If it is FRESHLY blasted metal and you have a nice, dry air supply, go with the DP. If it has been days since the blasting, I would use PPG etching primer (reduced 10%), let it sit about a half an hour, lightly scotch brite over it and follow with two coats of DP. As a rule, where I work I always epoxy prime a complete body or part the same day it gets blasted or stripped. Even if it means I don't get out of there until 9 PM. (like Neil Young says, rust never sleeps)
3.,4., Never apply filler directly over etching primer, and never spray etching primer over body filler, any type of body filler. Apply filler on top of cured epoxy after scuffing the surface with something like 120 grit. Assuming it will air dry as opposed to baking, allow the epoxy a few days dry time before applying filler over it.
When the filler is ready for the first coat of primer, use epoxy again, two coats about 15 minutes apart. Wait at least an hour and then (without sanding) spray a couple of coats of a high build 2K urethane primer (PPG K-36) on top of the epoxy.
5. DPLF is a good product. It used to be better, but we can't do anything about that.
6. The websites above should help.
I'll PM you the website address for the shop where I work and you can see some pictures of the process I go through.
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