I put on my first coat of Z1(polish lok) followed by Z5(swirl remover) yesterday. I want to put a second coat on today. Do I need to put the Z1 on again before the Z5, or is that just for the first time? I think I remember reading somewhere that the Z1 was only needed once every few months, but I'm not positive. I searced, but could not find my answer. Anyone know?