If you keep adding new coats of paint, it will end up losing all the detail and the panel lines will get washed out if you're not careful. If it were me, I'd strip it and start over. But then, if it were me, I'd strip it and start over just so I could clean up the spots where the resin meets the styrene and rescribe the panel lines around the hood and betweent headlamps and wheel wells. Transkits are very ambitious and no matter how good they are take quite a bit of work to fit perfectly. I think most people here would agree (it's been said a few times) that you are rushing this project. Something with this scope should be tackled with great patience. Doing something perfect the first time will prevent you from having to undo and redo things a second time.
Correct me if I'm wrong, but this is your second model. Just becuase it is your last and because you threw a lot of money at it you've won awards in design doesn't guarantee you a perfect model. I've built close to 20 and mine are still far from how good I want them to be, and I'm sure everyone here, no matter their level of skill, feels the same. Everyone is aspiring to a greater level. I'm not trying to flame you or fuss you or be rude at all, but the impression I've gotten from all your posts is that you think you've got incredible skill and ability. Granted, your first and second models are coming along much better than most of our first and second (unpainted, almost solid glue bombs from me at age 10), but you are still a beginner. I don't care how much natural skill you have, nothin replaces practice and experience. What we do here on this forum is try to help out new modellers with our collected experience. Posting your progress like you are doing can help highlight errors a modeller encounters, and share skills with others looking to learn. At the same time, people watching your progress can offer advice and help. What aggrevates me is that we've given you plenty of advice that you've ignored. Why? I don't know. But we don't give out advice for our health, we do it because we want modellers to get better. Models aren't a competition... ok well sometimes they can be, but it's friendly competition to raise the bar and help drive up the level of skill and amount of knowledge in the community. We wouldn't check in and watch the progress of this car if we didn't think it had potential, but if all the great, FREE information is going to waste, what's the point of coming here to show your build? You've had very little to say about the construction beyond the cost of the build and misinformation.
Anyway, I'm going to continue to check in on this model becuase I was promised the best 350Z ever. I'll be sorely dissappointed if this is not the case. I hate to say it, but so far I'm not really all that impressed.