Try Jescar Powerlock sealant topped with Colonite 845 someday. Great combo, easy to apply and lasts.
Good luck with the black! Ton of work.
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Duke
2018 X5 50i
2015 911 C2S
2017 X4 M40i (gone); 2010 X5 (last of the NAs); 2007 550i (still missed, except in the snow); 1991 525i manual (great 17-year run)
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