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Lots of parts of the process will alter how much product you use.
The gun set up and application technique being major factors.Regarding your project, candy is translucent and gets darker the more you apply... you stop when you're happy with the colour. Here's an example of that... there's only one green being used, it's applied in multiple coats with masking between coats to give different depths. https://colecoatingsworkshop.com/#/sausage-dog-camo/
With that in mind, you could end up using a little or a lot.
The size of the fan will determine how much you'll lose in 'overspray' and 'fall out'.
Also, when you're applying layers, you might find that the junctions are darker than the tubes because you'll hit these more on your passes.
I assume, the 1 litre of thinner will be what you use to mix both the silver base and the candy in order to make them gun ready so you couldn't possibly use everything in the kit anyway.
Would the 1litre kit from specialist paints cover a full frame and forks? Two?
Is there a way to realistically work this out or is it more based on experience?
Contents Outlined here:
https://www.specialistpaints.com/collections/specialist-paints-featured/products/candy-paint
P.s sorry to hijack!