For zinc standing seam, it could probably take advantage of perception to go with either the natural color in its authentic kind, such as that offered from Rheinzink vintage or with pre-patina that hopefully matches the color you are trying to find. My tentative choice is to wait till spring. https://residential-roof-installa45689.dailyhitblog.com/40903134/residential-flat-roof-installation-no-further-a-mystery