So I took a sharp intake of breath, spent most of a day masking, and painted the gold stripe. I went down the paint shop and found a paint chip that was a close match to my powder coated revolution alloys, so hopefully it'll all look right when it's put together.
I started with 3mm edge tape aligned with the edge of the red paint, then used a strip of 1.5" masking tape to get a consistent width of stripe, and put the next 3mm edge tape the other side of that. The 3mm plastic edge tape makes it much easier to follow the corners without the tape buckling, and then I went over the top with normal masking tape to stick it down properly. I started with 9mm edge tape, but it wasn't following the curves properly
I bought a new mini spray gun for doing blow-ins, and used it for the gold, as it seems to have great atomisation, and is very controllable. It's an ANI gun from spray guns direct, and only cost about £30 including postage.
First coat of gold base coat - a light dust coat to help avoid reaction from the thinners attacking the paint underneath, which I let dry off completely.
Then it got another 3 or 4 coats of base coat (can't remember) and the same process for lacquer - dust coat + 3 normal coats. I've tried to avoid going too heavy as it'll create a bigger step between the colours.
Once the car is built I will make good any paint repairs that are needed (I fully expect to scratch it along the way, and lacquer over the whole lot to try and hide the join between the colours a bit.
I'm using about 10% or a bit more plasticiser in the 2k solid colours and the lacquer, but not in the solvent base coat.
Some random pics showing some progression through the job.



I decided to give it a gold mouth... I have plans for a custom mesh grill job as well. Black background with gold teeth... not completely sure if I'll do it though.


These ones are with the first 1.5 coats of lacquer, I think.



Finally de-masked. Overall, I'm pretty happy with it, but there are a few little faults to correct - mostly little gaps between the red and the gold, where there's a thin sliver of white showing through. It's less than 0.5mm in most cases, but it'll still annoy me if I don't fix it.

One side of the mouth isn't quite right either.






I'm really pleased with the surface finish from the new gun - I'm not going to bother with flatting and polishing, because it came out very consistent and without any orange peel worth worrying about. Just got to fix the white 'bikini lines'.