Also known as “Paint Grip Steel”, bonderized steel is a type of galvanized steel that is treated with a phosphate bath and chromate dry. The resulting effect is a dull grey surface that is non-corrosive and has a micro-porous surface that acts as a primer, making it ready for the application of paint.
The phosphate process also provides an insulation within the galvanized coating and the paint, which makes the adhesion to the steel longer lasting. It’s advised to paint bonderized steel immediately after installation since the exposed phosphate coating is susceptible to white rust.
Due to the properties zinc phosphate creates, it is a popular choice for the roofing and gutter industry and perfect for rain gutters, downspouts, flashing and other materials that can be painted right on site.