You know that rusty metal on your roof can be an unsightly and potentially damaging problem. Fortunately, fixing rusted metal on your roof is easier than you might think. In this step-by-step guide, we'll show you how to transform your roof and fix rusted metal in no time. 1. Assess the Damage: Before you get started, inspect the rusted area on your roof to determine the extent of the damage. If the rust is superficial, you may be able to fix it with a simple cleaning solution. If the rust has penetrated the metal, you may need to replace the affected area.