Same deal with mine, but I have three holes behind it, so I mounted my horns behind the grill. Then used a few dabs of 3m Super Weatherstrip Adhesive Black to hold the grill in place. If there was a film to keep water out, its long gone. I doubt it would matter though, the CVZ open bow is just behind the grill location. On a CVX, I could see a reason to have the grill sealed should a wave break over the bow.