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Dupont Veriprime and PPG's DP 40,50 & 90 are probably the 2 most well known and used.

The DP can be mixed to look like the OEM dip gray primer as I think there is a white, green and black. (do some research on this).

I would guess on 1-1.5 gallons. Once mixed, you'd have 2 gallon or so of sprayable material. The DP can also be mixed as a sealer later on.

I personally like the DP because once its primed, rust doesn't come back and pentrate the metal.

Veriprime is also a good product, but if sprayed and left without a top coat for a while, surface rust will come back through.

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