Bryan, so your shop uses Duratec as the only primer? I had read of others using Duratec as the high build, easily sandable primer, then an epoxy primer over that before base coat.
Depends on the top coat they're using. They found that Duratec seems to be a reasonably stable base for most of the top coats they shoot...from the Axalta to the Glasurit. On 693R, for example, they did Duratec for first primer, sanded out, second coat, sanded out, third coat, 600 grit level off, then Glasurit sealer, then Glasurit top.
Of course, the body has to be straight and finished, but, seems that the Duratec was the answer.
@Richard48Y: typically, from what my body guy tells me, the sealer should be from the top coat chemstry/product line. IOW, don't mix PPG with Axalta, for instance. The primer, well-flashed off (I leave mine out in the summer sun for a week and pull in at night....) is pretty neutral, so the sealer is there to just provide a smooth layer in between to promote adhesion and barrier between potential issues. The fact that, 14 years on, 693R is still bringing home trophies (for her new owner in IN) is testament to the process my guy came up with (that, and 6 coats of Glasurit urethane single stage helps, too...
) Wish he hadn't retired, or else 3291R would be on a trailer to his shop as we speak. Lou D. here also used the same guy, as did RD. Dave (the paint guy...) was a true craftsman. Photo below is him shooting 693R in August '08.