I have a question for the paint experts. Should I paint a solid white coat before applying my single stage urethane finish coat to 1) lighten up the final color if I’m using a darker color like let’s say “Jaded Green Metallic” or “Tunnel Ram metallic”? 2) If I’ve already applied a 2k Grey primer is this an unnecessary step, would the final color darkness or depth be essentially the same? Thanks!