Quote:
Originally Posted by quality_sound
It doesn't shear anything off. The spots came back in the winter becasue of...wait for it...the snowplows' steel blades. What happens when you grind a big ass piece of steel on the ground at speed? You essentially sand it and that leaves steel debris that then gets mixed in with the slush and flung onto your car. You won't see the spots until it gets above freezing when salt becomes active and the water ont he car has enough dwell time without refreezing to cause the steel to rust.
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Wrong answer!!!!
The iron from snow plow blades doesn't imbed into paint like rail dust. The only reason that rail dust imbeds into paint is because it is extremely hot when it is flying around in the rail cars. Iron in slush and water will not penetrate and imbed into paint.
By the way...... do a search on detailing clay and you will uncover that it does indeed shear of contaminants, that is how clay works, with shearing action.
Quote:
Originally Posted by quality_sound
A clay bar, if being used correctly, won't cause swirls. The "used correctly" part is key, however.
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Clay is an abrasive and will cause marks unless you are extremely careful, even with a good clay lube it can still cause micro marring. Most people just can't see it, only a trained eye can detect it.