Eastwood says it has a 48 hour pot life once it is plungered/mixed.
IIRC, the Spray Max stuff I have says pot life is 3 days after mixing. {on edit} I just looked it up the company info says it's 4 day pot life. They have black and white epoxy as well as the primer I have.
Link I think it's a little cheaper than the Eastwood stuff if you can find it (try a local auto paint store). I buy it locally, as Eastwood (or anyone else) won't ship spray paint up to Alaska.