Should NOT be used on bare metal parts, brake calipers, wheel balancing weights or some paint repairs. Mask off these areas. Avoid letting it dry on any surface. It is easy to use and you can see it working! It is a clear solution in the bottle but it turns purple when it comes into contact with sintered iron particles. It turns the iron into a water soluble complex for easy removal, after five minutes of dwell time wipe down the surface and rinse thoroughly after using it. You can polish and clay bar your vehicle as you normally would. After your car is prepped properly it is ready for wax, sealant or other forms of surface protection.