I use a water blade too. The S-420 has lots of large flat areas. Perfect for a water blade.

I don't doubt the people that say they do but I don't see how it could possibly scratch someone's paint.

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1999 Silver/Gray MB S-420
Chrome 18x8.5 AMG Aero IIs
Pirelli P-Zero 235/50/18
Tint
Zaino user