CJ--
Like Jim, I may be having second thoughts (at least as of 1 minute ago) about the need to switch primers, because I really don't have much left to prime. I think I have enough Variprime left from that original gallon to get up through the aft fuselage (including the skins).
Now that I'm pretty much finished priming the aft section, I really don't want to prime any of the center section because I'll be spraying an interior paint coat in the baggage and cockpit areas. I'm thinking that I'll only spray center section parts that get riveted together now and wait to prime the rest of the interior (side skins, baggage skins, top of seat skins, top of floor skins, etc.) until just before I put the finish paint coat on--that way I don't have to sand or rough up anything in the center section before the top coat goes on.
Thus, since I really don't have that much priming left to do--just a few a few baggage and seat ribs, longerons, and a little bit of angle--I may just finish up with spray cans of SW GPB-988 for these few remaining parts. It really seems like I'm quickly approaching the stage where saving up parts for big priming jobs is more and more difficult. More often now, I would really prefer just to prime a few parts at a time and then rivet them on right away. In this case, maybe the 2-parts like Variprime and Nason will be more work (and maybe with more waste and more $$) than they are worth
Again, just my thoughs as of this moment.