WHY?
Primer is the “glue” of a paint job. While exterior paint is made to adhere to other paint, it is not well suited to adhere to bare wood, aluminum, or metal, in many cases. Application of a primer coat to the above situations allows the paint to adhere correctly, thus extending the life of your paint job. Without a primer coat to these situations, the paint would fail much more quickly, leading to more painting being done sooner rather than later.
COMMON SITUATIONS REQUIRING PRIMER
Bare or unpainted wood – In the situation of uncovered wood we use a common oil or latex primer from the Sherwin-Williams Company. The primer will be applied and allowed to dry before any painting is done.
Aluminum - With an aluminum surface we will apply a product called E-Bond from the Sherwin-Williams Company. E-Bond is mixed with the first coat of paint. It is designed to allow paint to be able to adhere to the aluminum surface. A second “top-coat” is usually necessary to ensure proper coverage.
Steel - A steel surface requires a full primer coat of a product called MetalPrime, also from the Sherwin-Williams Company. MetalPrime serves the same purpose as E-Bond. It is specially formulated to allow paint to adhere to the previously unpaintable surface.