I bought it off a user for about $300 already painted Berlina. I had considered getting the CF version brand new for a little bit less, but then I would have had to paint it so it would have been more.

 

So, just the double sided tape (automotive type) is enough? You didn't have to seal around the holes? Thanks

 

Double sided tape is a good material for many things automotive. However, use of it where your spoiler meets the trunk lid may (depending on exact application) result in a small gap between the spoiler surface and the trunk lid. If "the look" is OK with you, double sided tape would be good at preventing scratches on the trunk lid.

But this tape has a habit of deteriroating over time, especially on external applications exposed to the sun. Should this happen, it might suddenly become non-water tight. My plilosophy about putting chemicals on or near my car's finish is to start with the mildest and most non-damaging thing possible. To ensure that you don't get leaks into the trunk through bolt holes, I will continue to recommend Marine Goop. The water that might make contact with the bolt holes is not under pressure, such as it would be in a plumbing pipe or near the bottom of the hull of a deep-draft large boat or ship. Because the water is not under pressure, the sealant needn't be as strong (and difficult to remove) as that used for water under pressure. Basically, with its purpose in mind, I've never has a leak when trying to keep out "no pressure" or "low pressure" water with Marine Goop. Ever want to remove all the Marine Goop? Usually you can peel it off with your finger nails. Any residue left can be removed with something like 3M trim adhesive remover.

 

I have gone ahead and done a couple of things. First, to combat the water intrusion, I used that goop around the holes and bolts. Then, to prevent scratching of my trunk lid, I got some 3m trim tape. The kind with the red backing. Everything is sitting good now, and time will tell if it leaks. Thanks for all your help.

 

I used silicone sealer on mine and it doesnt leak

 

I have the BYS Spoiler, I put a dab of silicone on the holes from the inside and I havent noticed any leakage from the spoiler