zinc

This relates to a discoloration of zinc although not part of a roof but as it's the same material as the zinc on roofs I reckon this is the place for my query. I have zinc cladding on my windowsills but two of them have discoloured badly. There are pinkish lines and an overall variable tone to...

There is a leak where 2 pieces of horizontal zinc guttering connect. The soldered/welded connection seems to be broken. How can I repair this? Is something like gorilla tape an option?