I've been using Zaino for several months and have a number of Z2 layers. I do have some swirls which obviously Z2 doesn't address. Are those using Z5 pro w/ a PC satisfied with swrirl removal and if so can I apply it right over the multiple Z2 layers; OR should I allow the Z2 to wear off (or strip) and start over with a more abrasive polish for swirl removal such as Menzerna. Thanks