Still working on this. I've been a bit of a nit picker over details, so I've restarted several times from bare metal. This last time around I'm fairly happy. When I sanded the black off the lettering, with 4 coats of clear over several coats of white, I did sand through a couple spots. That's due to the plate not being flat, although I could have been more careful. Today I sprayed some of the white into a small container, and used a very fine brush to touch up the few places I went through. There were a couple black spots that showed also, so I covered them also.
It's been about 2-1/2 days since I sanded last, so I should have been good...but one small spot on one letter wrinkled a bit. I'm planning on another coat of paint brush white and a finger print sized sanding area to see how flat I can get that. I won't touch it again until the weekend though. I think I will be happy with the out come.
Then I'm going to let it sit a full week. After that I'll clear coat the entire place back and front. Then I'm going to hit up the CA DMV to get the plate transferred to my truck. We'll see how that goes in the current climate.