Instead of taking an off the shelf automotive plug, we went all the way and made our own tool to create these bumper covers. The end result is a surface without sink marks and smooth curvature transition. Once painted it gives a very consistent gloss and finish.
Please note the cover's color are painted to original color code. There might be slight differentiation to your car's existing color due to the weathering of your car's paint from UV or chemical in your environment.