http://www.durabakcompany.com/
I've been wanting to order some of this product to coat my Metal patio table and chairs and also my "Gangbox" tool box for my truck.
Their website shows hundreds of examples on off road trucks, boats etc. I think it's about eighty dollars a gallon.
Here is a good photo collection of the product in use.
http://www.durabakcompany.com/photogallery.htm