epoxy paint ?'s

When ever I get a part back from the blaster I suff it then seal it up with a reduced coat of dp (or if I know something needs to be water proof) then do what ever finish body work on top of the dp after I scuff it with 80 grit, then do my primer and seal it with another coat of reduced dp then paint right on top of the dp. I use 401 (I believe, its the catalysis that has to sit for 1/2 hour before you can spray the dp not the 402 that is spray-able as soon as you mix it * It's been a long week and I could have those mixed up, I honestly can't remember right now) Anyway and then the base goes on right over the fresh top layer of dp.