My friends are still riding wheels I dyed in March. My brother is riding an Agent Orange I dyed towards mid 2008. You're doing it wrong.
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In summary: Dye urethane. Paint cores.
I have to go with RUPs. I've ridden both and the MGP just feels a tad too weird, but the RUP still feels natural even though it weighs nothing.
Meh, foldable scooters ftw.