It’s just another fact of life—sooner or later, all coil-coated metal is going to be fabricated (cut, punched, bent, stamped, etc.), and as a result there will be, in most cases, an exposed edge that one would think would be susceptible to corrosion. Given that long-term durability and corrosion resistance are key performance properties of any painted metal product, this is a big deal.
The type of metal and its coating type have a major impact on the prepainted metal’s ability to follow through on its promise of long-term durability. Decisions made at the beginning of the manufacturing process dictate whether the metal will last or start to corrode after just a few short years. NCCA has studied the long-lasting performance of cut edges on prepainted metal; more details on the study can be viewed in Tool Kit #5, Cut Edge Protection Using Prepainted Sheet. Continue reading