Just got off the phone with TotalBoat. After describing what I'm trying to do and the need for more paint control options on the fiberglass, they said basically the same thing that I can either atomize an extremely thin topcoat paint layer to make the blue of the highest possible translucence with the white primer underneath showing through, or to experiment with mixing topcoat polyurethane marine-grade paints together and it will still grab onto the [220 grit lightly sanded] epoxy primer coat like nobody's business. It's recommended across the board to mix only paints of the same manufacturer.
Also, TotalBoat now has a lighter blue color available but I put in an order instead for their Blue-Glo White color paint to mix with what I've already got. The plan is to add 50ml of Blue-Glo White to the Largo Blue, assess, and go to town painting the topcoat onto these chairs. Free shipping, but there's a $5 HAZMAT charge. It'll be here in 3 days.
Again, there's no particular color number available to aim at for TOS Burke chairs, rather, there is some ill-defined range of medium to light-blue and this is better than nothing, but I tend to think of paint colors or mixing paints in terms of numerical values in order to reduce guesswork, to match paints later down the road, Murphy's Law, etc., etc. Given this ambiguity all I can do is try it out, see how the color looks after it's dried, and if it turns out as intended, publish the color mix ratio and the technique used. The more layers of paint used, the more depth there is likely to be on a given painted surface. If you like zero depth finishes, I would say to use no primer and one coat of pure flat paint. Touching up whenever the Burke chair gets scarred is what it looks like they did on TOS. However, what it looks like to me on TOS chairs -- regardless of the level of lighting involved -- is a semi-gloss paint.
Not only is TotalBoat a marine-grade paint and accordingly of the highest in solids paint commercially available, it also has one of the higher rated UV protection additives since this paint is used on ocean craft. The advantage here is in using the 1.4mm nozzle HVLP spray gun which gives a spray-gun operator maximum control and lots of flexibility. The best finishes I've ever seen are with the HVLP type spray-guns.
I've mapped out the process for the painting procedure in detail and put it to memory, but want to wait until after I'm done to record the exact procedure here so that anyone can duplicate it if so desired.
The star pedestal painting procedure with Interlux brand steel gray paint will be a lot less complicated.
This cheaper version of the 1.4mm nozzle HVLP spray-gun will work fine if you're only painting a couple of chairs and pedestals and perhaps every now and then something else. If you're painting fiberglass auto-bodies in gloss black, I really like the Sharpe version as a personal preference.