I suppose this is mainly aimed at Rich, but if anyone knows then please feel free to butt in...
Is it worth buying both P21S and the Optimum Car Wax and applying one after the other, or will the OCW sealant effectively do the job of the P21s as well, and vice versa?
Is it worth buying both P21S and the Optimum Car Wax and applying one after the other, or will the OCW sealant effectively do the job of the P21s as well, and vice versa?