That happens when you drive too close to the kerb and rub the sidewalls. This can damage the sidewalls enough to give you vibration or wobble at high speeds.
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Technically speaking the tires do not require alignment. It is the wheels and their axles that are aligned. The reason is that the attachment points for the axles are constantly moving and incur wear. In addition, the axle's supports can be bent by the vehicle hitting a pothole or striking a curb. The resulting misalignment causes the wheels and tires to not track properly (all point in the same direction). This causes the tire to scuff as it travels over the road. This scuffing wears out the tire prematurely and increases the misalignment. So the simple answer as to why wheels/tires should be aligned is to save the tires from being worn out before their time.
I don't think you could paint them successfully. The scuffing of shoes would remove any paint very quickly.
In painting or staining, providing a surface with tooth is a way of roughening the surface so it will "bite" into the pain coat, and hold it in place. "Tooth" can be supplied by scuffing the surface using sandpaper, or steel wool, or it can be provided by a type of undercoat. It's purpose is always the same - to make the top coat grip better.
Cordovan tires are made in Florida, USA.
Cooper Tires