also noticed that some bras are thicker than others for added protection. like the Xpel i installed along the rockers 2wks ago is about 35% or so thicker than the clearbra's used on the front of cars. the thickness adds more visible line.
i dont care though since i already saw a rock imprint on the xpel from my drive over the weekend which could've taken a chunk of paint off... but it didn't.