1. With 3M primer on all surfaces in question, place 3M tape on fin side in a fashion that wont allow water to suck in while driving forward, pace on car with bolts 'half way in' for alignment.
2. With bolts half way in, use something spongy to lift up on spoiler to halfway installed bolts, carefully remove red 3M seal off 3M tape. (A set of pointy tweezers can be your best friend through all this.)
3. While keeping it even and straight with fingers side to side, carefully lower and stick spoiler down firmly. Tighten screws lightly to hold.
4. Back each bolt out 1 at a time and use adhesive caulking under and behind screw head in trunk lid area to form a seal, allow to dry.
5. Fill in front and top of bolt with caulk and smooth with wet finger, and clean up surrounding area,(as in photo) allow to dry.
6. Paint with touch up paint to match your car. (not shown)