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Dupont Variprime is a popular primer that has a yellow/green appearance. It is an etching primer not an epoxy. It is an excellent primer if you are going to paint right away and the car is being stored indoors since etching primers will absorb moisture without a topcoat. The yellow/green color is from the zinc chromate pigment used in the formulation. Although it ZC is an excellent corrosion inhibitor, it is real toxic and supposedly a carcinogen when sanded and inhaled.
House of Kolor KP2-CF epoxy primer has a light green appearance. The old version had chromate pigment, but they now use a non-chromate formulation. They probably add an inert green pigment to mike the new stuff look like the old. KP2-CF may be what was on the tv shows since it is quite popular with hotrodders and restorers. Its an expensive, premium epoxy primer, but you probably get what you pay for.
As for Volvo primers, it's an E-coat primer. With E-coat, they dip the whole car in the primer and an electric current is passed between the chassis and the tank. The current causes the specially formulated primer to have a strong bond to the metal. It probably has a zinc phosphate or white lead inhibitor in it judging by the gray color of the primer on my 164. If the factory primer has a light yellow/green appearance it is most likely zinc chromate. I think all Volvo's after 1984 are galvanized, so they probably used some type of thin tie-coat sealer before applying the topcoats.
Certain parts of some of the older cars were galvanized as well. The front panel of my 164 is galvanized. Note that you can't use alkyd (oil based, Rustoleum etc.) primer or paint on galvanized. It will eventually rub or peel off. There are special tie-coat primers for galvanized, or you can use an epoxy or lacquer primer.
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