Look on the inside door of the new vehicle. The date of manufacturer is clearly stamped along with other manufacturer's information or ask your dealer to help identify the assembly date. Waxing is safe after 30 days of assembly. Most cars at a dealership are over 30 days old and are safe to polish anytime after delivery.
working at a bodyshop,
we inform customers to wait 30 days before hand washing painted panels with soap and 3 months before waxing painted panels.
this is pretty much the guidelines set with the dupont paint warranty.
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