CDC CLASSIC CHIN SPOILER!!

Shouldn't have to clay bar it if you use the adhesion promoter. I know mine came with a kit with 3M tape and adhesion promoter. I can say don't do it without the promoter or it'll likely have a spot or two come free at some point.

All you need to do on the bumper is clean it several times with rubbing alcohol using a clean towel each time. The adhesion promoter is for getting the double sided tape to stick to the spoiler, not your paint. Set the spoiler in a warm area which will allow it to be more flexible and easier to work with. First, do a test fit to see how it fits and what stumbles you may encounter (I had none). Once satisfied with the test fit, remove only a few inches of the tape backing (at the center) and allow it to hang over the top of the spoiler. Gently place the spoiler on the bumper and apply light pressure so the tape holds the spoiler in place. Go to each side and work the spoiler end over the bumper corner. If it needs to be adjusted a little you may do so since there isn't much tape holding it on yet with full pressure. It says to remove the wheels for putting the screws in the wheel well, but it's quicker if you just use a stubby screwdriver and turn the steering wheel full lock for each side (what I did and worked just fine). Now go back and start pulling the rest of the backing tape out from behind the spoiler. Press firmly along the entire spoiler where the tape is and enjoy I never had an issue with mine wanting to come off and I hit it against any and everything! It was strong enough where I could put my foot under the spoiler and lift up and the entire bumper would flex up to the headlights Even when the front of my car was smashed, it broke the tabs on one side, but most of the tape was still holding it on very nicely!

Here you can see the impact it took and how well it held up!

Rub the attachment area with a green scratch pad. Then once you use the adhesion promoter, it will never come off.

I think these guys pretty much covered it...I just took mine off the other day and it looks bare without it.