Ken, If you have been using PPG product to this point stick with it. That extra cash will seem like nothing and you will wish you spent it if the other product wrinkles or peals off the primer/sealer. I have been using the PPG shopline up to this point and have been extremely happy with it. As for single stage matching BS/CC it depends on the color, weather it's metallic, etc. With a straight red if your supplier has the mixing recipe for both you will probably be fine. As mike indicated those areas are low light low visability and nobody will know the difference. My 2cents, Rich