Any PPG primer that is recommended by PPG to go with whatever line of PPG topcoat you have.
The DPLF line of primer is excellent and is compatible with most other PPG primers, sealers, and topcoats. You should consider getting a color that is closest to the final coat color (in terms of tone/darkness - I do not know the correct term).
http://www.ppg.com/cr-refinish/phase1/frmFindProduct.asp You might want to search this forum for an excellent "Basics of Basics" article about primers and sealers by MARTINSR.
