Hammerite Direct To Rust Metal Paint can be painted directly onto rusty surfaces and, thanks to its special 3 in 1 formula, there is no need to use a primer or undercoat - saving you precious time Hammerite forms a superior barrier that not only seals out moisture, but also gives long lasting protection, both inside and outside. Touch dry in an hour, Hammerite is corrosion resistant and is suitable for use on a wide range of exterior metal including gates, railings, drainpipes, guttering and garden furniture. Protects for up to 8 years.