Apparently opticoat can be layered, although I've heard its a law of diminishing returns.
The car was probably washed/clayed/IPA wiped down prior to application from the sounds of things. Amazing to hear your paintwork was in such good shape (lucky bugger!), I thought mine was too until I drove my car into the full sun. Couldn't tell at the dealership as my car was undercover.
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F30 328i Sportsline
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