Choosing the correct primer for involves selecting specialized rust-inhibiting formulations that chemically bond to the metal, such as zinc-rich epoxies or DTM (Direct-To-Metal) anti-corrosive polyurethanes. The primer’s purpose is to passivate the metal surface, halting existing corrosion and providing a stable base for the topcoat, which is particularly vital in the salt-laden air ... https://kkroofspecialist.com.sg/painting-metal-roofing-singapore/