Spectrum Sludge

[GenY]

I have a gallon of Spectrum Sludge and I was wondering where to put it on the undercarriage of my car? I have a 2012 Ford Focus. I was gonna do the wheel wells but I need 2 gallons for that and also need to take off the wheels which I can't at the moment. Any sweet spots that can lessen engine or structural noise? Thanks for any advice. Cheers.

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[Kickstand Premium Member]

The only place I have ever used it was on the inside of the car