I think the challenge is the two part epoxies primer/sealers like DP74. There are companies that sell clear coats in a can but not sure if you can get those filled, with two separate sections in the car that mix once you activate the process just before application, custom like the simple single stage rattle cans.
With the Pressure attachment to the container you could mix the paint and the hardener in the container and spray if you have to have to use a rattle can. Another option might be to just mix and brush the product on once its reduced to a point where it will not leave brush marks nor be so think as to stand out once dry.
Just a thought