A word of CAUTION here...
I cheeped out an went for the generic rattle can primer labeled "Brite Touch". (Yea, it was half the price of the famed Dupli-Color). Guess what? It went over my Nitrate base well. Sanded off "most" per usual. Then, since I was going for a yellow finish, I sprayed a light blocking coat of Randolph white. Well, it melted the primer which also shrank, leaving those little cracks all over the stabilizer finish. Several sandings, and careful recoatings with the Randolph covered the problem.

Ward