Galvannealed is the main Paintgrip used in the duct fabrication industry taking the place of Phos Bond which used to be the only option many years ago. A40 Galvannealed is the most commonly used coating, while A60 is less popular because it tends to be too powdery when it sits unpainted too long. Galvannealed does not flake off its Galvanized coating when formed which makes it ideal for HVAC duct shops that use it in the roll forming processes of making Pittsburgh locking seams. The matte finish acts like a primer, allowing paint to adhere easily, and is rust proof if kept indoors before painting. Galvannealed has good paint ability, weld ability, corrosion resistance, and form ability. It is extensively used in the automotive and signage industry.