At a guess, it's Losi springs we're on about, as Phil will have loads of these and probably feels the car runs well with them. I'm sure any info will be passed back to the HB development team and advice will be taken on board, all part of R&D!
Anyway... to remove the paint you could probably use a harsh brake cleaner, or has been mentioned, Nitromors. Soak them in this and then pop a blob of coloured paint or nail varnish on the spring afterwards so you can tell what they are.
PS I'm running Losi springs on my RB5 and will be on my ZX5, because I've got them and they fit! Haven't got round to getting any Kyosho springs yet!
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