David, I live on the east side and don't usually shop at Tammies. I used to work there when I was in high school though ('85-'88).
I ended up putting on the LusterKote primer. I came to that decision based on an exhaustive search on RCU. It seemed that the majority of people said that the LusterKote would work. However, at $8 a can, and the 24 hour cure, it does not seem to be a good deal. I think I may try something else in the future.
Giant Scale, I don't know why, but I found more posts warning against using Rustolium than any other primer. Your advise seems unique. Just an observation.
Anyway, the project seems to be coming along nicely now.