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Onr should be fine but does have polymers that some think may affect performance of coating. If you have ONR use it. Once gone maybe look at Griots brilliant rinseless. Has no polymers and cleans well.
Why would you be worried about using ONR over a coated car? Optimum recommends using it over all their coatings (Opti-Coat, etc). Beadmaker is fine over all LSP's (carnauba, sealants, and coatings).
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