The DP90 expoxy primer/sealer is an excellent two-part product. DP90LF is the lead-free version. 90 is the number-code for black. There are other number-codes for other colors of this expoxy primer (many people recommend using a primer color similar in tone to the final coat).
This information is a little out-of-date and there might be more colors now: DP40 is gray/green, DP48 is white, DP50 is gray, DP74 is red, and DP90 is black. You can obtain identical colors in DPLF as well as DP60LF, which is blue.
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