(2) Epoxy primer. An epoxy primer is a two-component pigment primer specially made to
stick well and reflect heat. It is nonchalking, nongloss, and very resistant to chemicals, lubricants, and
corrosive atmospheres. This primer is made primarily for spraying; however, you may brush it on small
areas. Mix it by adding equal parts, by volume, of the pigmented primer to the catalyst just before
using. Use epoxy primer within 10 hours after mixing. Because it is an epoxy, this primer is difficult to
remove. There are several types of epoxy primers designed to be used on specific items. For this
reason, you should follow the manufacturers recommendations when using them.
(3) Phenolic-resin primer-sealer. A phenolic-resin primer-sealer is a new type of finish that
is well suited for open-grain woods. It penetrates into the pores of the wood, dries, and equalizes the
density of the hard and soft grains. Staining and painting of wood thus treated eliminates light and dark
streaks that are frequently present on untreated wood. This sealer is light amber in color and almost as
thin as water. You can add pigment as well as color in oil to produce almost any color desired.
(4) Wash primer. The term wash primer designates a specific material that combines the
properties of an inhibitive wash coat or metal conditioner with the properties of a conventional
anticorrosive primer. The essential components of wash primers are phosphoric acid, zinc chromate
pigment, and polyvinyl butyral resin. Wash primers can be formulated so that they are equally effective
on iron, steel, aluminum, treated magnesium, copper, zinc, and a wide variety of other metals. Discard
mixed primer after 8 hours. Many coatings adhere well to the wash primer, including oil-based alkyds,
epoxies, and urethanes. Wash primers-
Apply easily and dry rapidly.
Are usable in wide ranges of temperatures and humidity levels.
Can be applied to a variety of metals with good results.
Provide temporary protection until a protective coating is applied.
Prevent or retard corrosion development.
Exhibit a high degree of adhesion to metals.
Upgrade the performance of subsequent protective coatings.
(5) Zinc-chromate primer. Zinc-chromate primer is used in tremendous quantities by the
armed forces. Its rust-inhibitive qualities prove very satisfactory. Do not use it in a straight linseed-oil
vehicle but in a synthetic resin vehicles, such as phenolic resin or alkyd resin. For priming structural
steel, the addition of some raw linseed oil is advantageous. Use zinc-chromate primer as a primer for
metal surfaces, such as structural steel, bridges, tanks, refrigerators, railroad cars, motor vehicles, and
(6) Metal primer. Pigments of lead and chromate are considered hazardous; as a result, two
other primers have replaced red lead-based primer They are zinc-molybdate