Problem Solver - Zinc
Other Problems
Zinc is a fairly reactive metal that will combine with oxygen and other non-metals. Zinc metal tarnishes in moist air It is soft and malable.
Preparation
Dry brush the surface down using a stiff bristle brush to remove any loose materials
If any mould or mildew is apparent, treat with a suitable fungicidal solution, rinse again with clean water and allow to dry.
Make good any defective areas to match existing
Basecoat
Once the surface is clean and all loose material has been removed, treat with a suitable primer and allow to dry.
Apply a suitable undercoat
Topcoat
Apply a suitable topcoat