Brand new windows rusting
We are in the process of buying a new construction home which has casement and sliding windows. Well the sliding windows are already showing signs of rust. I'm not sure when they were installed but probably at the earliest last fall before winter (we live in MI). We still have to do a final walk through and want to bring up the issue of the windows. I'd like to have some prior knowledge of what might be going on before talking to the contractor about it. Also, they are either vinyl clad or full vinyl. I'm not familiar with vinyl windows (we currently have wood) so I plan to take a look at a few shops to see how they are constructed as well. The windows were already installed and we had no choice in the manufacturer.
When I looked at the windows, the weep holes are covered by a plastic hinged door. Also, you can see rust at the lower seam edge. So I'm trying to determine if this is a window defect/installation etc.