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The Ducco car paints that Fender used did vary slightly from batch to batch. The solid colour can fade with time but the main variable in its appearance is the yellowing of the clear top coats. Hence, the confusion between Sonic Blue, Daphne Blue and the greens.
I sprayed my strat sonic blue and used light tint lacquer to give an aged feel. As mentioned above, it yellows the finish a bit. All sprays bought from Manchester guitar tech.
I think the faded Sonic Blue which Fender uses on some modern guitars is just a colour they dreamed up, and achieved by adding more white to regular Sonic Blue. Whilst some people really love the original Sonic Blue shade, many more find it too strong, hence Fenders creation of the 'faded' version. As others have said, vintage sonic blue guitars are more likely to take on a green hue. In reality I don't think any vintage instruments 'faded', it's just a name dreamt up by someone in marketing.
Sonic Blue ...
baby blue or, even worse, Man City blue
SCRelicsGuitars said:you won’t be able to achieve this shade out of a can unless you find someone who already retails these niche colours. You’ll need to mix it and have it sprayed through an HVLP setup or the likes.