Yes, you need to pay attention to the original details before removing the original stuff, I used this pic (and MANY more close ups to show details) to get a good feel for the patterns and which areas and which parts were covered or not. You need to be sure all of the right components are attached before spraying. In this pic you can see that the fuel tank, spare well and floor pan plugs, shocks, axle bumpstops, fuel lines, brake lines, and fuel vent hose cover on the drivers side, etc. were installed first, then undercoated.