Apply Silicon to the Moldings

mis3

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PT
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Ontario
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Mercedes, 2018 SI Coupe
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I am planning to get rust proofing for my 5-yr old SI coupe.
I was in the dealership the other day and I talked to a mechanic on this. He suggested Known or Rust-Check. He also suggested that before the procedure, it is best to apply silicon to all the moldings like the one around the doors.

is this a good practice?
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