Like others say, get some silicon adhesive sealer. When I went to put on my spoiler on the old car, I had to chop off the 3 bolts, then apply the silicon sealer thingy (mine was clear/see through), and hold it in place with some masking tape. Leave overnight to dry and jobs a goodun. Had mine on my car for a year (before I sold it) and it held on superbly.