I didn't know Rustoleum 2X primer was enamel. Back in August I primed 8 projects with the Flat White, Flat Gray, and Flat Black 2X primer and a couple of weeks later using the spray cans, sprayed Tamiya on 2 and Testors Extreme Lacquer and Model Master Lacquer on the other two with no problems at all. So unless they make 2X in enamel and lacquer and I used lacquer, there should be no problem.
An example of one of the cans I used
The cars I painted over the 2X primer with