The problem is none of the companies making these are putting the effort to 3D scan the existing surface of the taillight area, and as a result the water proofing seal is forced to do all the work of making the contours as well. With the GJ unit, I had good luck with mine doing two rounds of tightening. After tightening it the first time around, I waited a few months for the foam to compress and settle, then I tightened it again to get it water tight. I am guessing you are going to have the same problem with the evil unit.