I thought I would ask before I attempt yet one other project.

I have 2 old vintage galvanized metal containers in the yard that look great, junky as they be, but have thought of doing a mosaic on one or the other and want to be sure it will hold up ok in the outdoors.

I have done a metal newer not vintage galvanized item that sits on the porch, semi covered and never had a problem with it. Just wanted your opinion. Also it will do ok in the outdoors. Any photos? Thanks