My friend was given an '87 BMW325? by his uncle. The car is in really good shape except for the paint. I have done the detailing on my '02 Trans Am but am not comfortable PC and polishing on this car. It does need it. How do I tell if it is base coat/clear coat? Does that matter with the PC. I have tons of different compounds, polishes, pads, and waxes, just not sure if I can use it on a car this old. Thanks in advance for the input.