Red Oxide Primer is a type of paint primer that is used to prepare metal surfaces for painting. It is typically made of iron oxide, also known as rust, mixed with a binder material, such as linseed oil or alkyd resin. This is known for its ability to protect metal surfaces from rust and corrosion, making it a popular choice for industrial and commercial applications. Red oxide primer can also help to improve the adhesion of subsequent paint layers, resulting in a more even and durable finish.