Sheet metal?

I second that on the cleaning with a grinder and sanding pad! Also, the "fumes" that are created from Galvanized Metal will give you ZINC poisoning! Very nasty situation. If you ever have to weld it, make sure its well ventilated! I have had Zinc Poisoning myself. NO FUN!!!!

been there. Doc said to drink lots and lots of milk, and if I ever weld it again to weld 5mins then go out into fresh air for 10mins.