For the crack the best would probably low viscosity UV resin like used in windscreen chip repair. They come in different viscosities. Depends how long the crack has been there, if a long time then there is likely some dirt in 5here so not sure how well it would seal up.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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