PPF CS trunk spoiler and front lip

I had a CS spoiler, CS front lip and OEM diffuser installed on my f82 m4.

I took the car to my ppf guy and he had a difficult time installing PPF on these parts. I noticed he was struggling to install on the following areas:
1. On the rear spoiler due to the dip in the middle of the spoiler
2. All the curves on the front lip
3. The fins on the rear diffuser

Does anyone have any tips on how to best install PPF on these parts?

Looking for maybe a template or how many pieces it took, cuts. etc.

I rebuilt my CS spoiler due to damage. I did the carbon fiber repair but not the PPF but it cam out as good as knew so it's possable
Before

After

Looks great. Did you strip off the clear coat with sand paper and then spray with clear coat?

How are you finding the Sliplo, is it effecting in protecting the lip?

I only posted one before picture but the damage was extensive. I just roughed the surface and I did my repairs with sanding and resin. I recreated the Carbon Fiber look with paint and tooth picks on badly damaged sections.
Here is one trick I learned. A hex drill bit will remove the stone chip damage and leave good edges. Fill dimple with resin, sand.

I didn't finish with resin top coat as it's too complicated a shape. I used sandpaper from 400 working to 3000. I compounded and polished before taking it to the PPF installer
The Sliplo's are holding up great but they do remove a little of the already limited ground clearance.

Hopefully the PPF keeps it more protected going forward. You did such an amazing job it would be annoying to have to do it again but sounds like a fun project.

I'll keep that trick in mind, when getting my windshield repaired the guy does the same thing, drill and then fill.

What resin did you use?

400 to 3000, is 400 too coarse or is it a good starting point? I watched some videos of cf repair and was concerned that 400 would take off too much but I am a complete newbie when it comes to this stuff so I don't know anything.

Hilarious profile photo btw

I don't want to do it again. I wanted to keep the car OEM or I would just have ordered a $1200.00 knock off. The culprit is trailering the car, it is hell on spoilers and I'm done with that.

I didn't figure out the drill and fill until I was under the gun to keep my appointment with the PPF installer. For stone chips, you can't beat it. The white that shows is damaged resin not the carbon fiber. Get rid of the white and fill and then do standard paint correction technique.

As for Sand paper, like paint correction anything you do you have to fix. If you can get the surface repaired with 600 then that what I would start with.

My damage was 400 level damage



I used standard over the counter resin and hardener.

It's to be expected with a front lip but we will see how bad it gets. I was thinking buy a cheap CS lip to see what happens and if all is good and it doesn't get completely destroyed then I might upgrade to a nicer one down the line.

I remember driving around San Francisco and it was a complete nightmare. Can't image how it would be with a lip.

I think the best we can do is PPF the lip, stick on Slip Lo underneath and hit the bumps and ramps at an angle.

I noticed you also only stick one row of the Slip Lo on your bumper. Do you think it would make a difference attaching multiple rows to basically cover up the whole bottom of the lip like how they have it in the marketing photos. Obviously they want you to do that to well more product but I can see putting some on the rear of the lip helping

ABCDEFG111 wrote

It's to be expected with a front lip but we will see how bad it gets. I was thinking buy a cheap CS lip to see what happens and if all is good and it doesn't get completely destroyed then I might upgrade to a nicer one down the line.

Some of the non-OEM spoilers are really good and if it wasn't my desire to keep the car original I would go that way. Also the OEM CS spoiler has a unique mounting kit and when I checked the were unobtainium.

ABCDEFG111 wrote

I remember driving around San Francisco and it was a complete nightmare. Can't image how it would be with a lip.

Mine hits a lot more than I would want. Lots of slow angle entries in my future:D

ABCDEFG111 wrote

I noticed you also only stick one row of the Slip Lo on your bumper. Do you think it would make a difference attaching multiple rows to basically cover up the whole bottom of the lip like how they have it in the marketing photos. Obviously they want you to do that to well more product but I can see putting some on the rear of the lip helping

No if it going to hit the row I have the second row won't help IMO.

Do you mean the lip or the spoiler? I was actually able to easily order the OEM CS lip hardware from Getbimerparts. A little pricy but I wanted to install it properly.

The spoiler was just installed using 3m tape.

They are both spoiler's to me but I guess splitter is more appropriate these days. It was over a year ago when I contacted several companies and they didn't have any OEM front spoilers/splitter and the dealer couldn't get one either and it was crazy expensive. I was told If I chose a third party "front' spoiler to not lose the OEM mounting hardware as they were not available. The4 third party spoilers I looked at are different and use different mounting. That's why I chose to repair.
I just took a look and I don't see anyone with the oem spoilers/splitter. Guess I better take care of the one I have.

Yeah I gotcha, there are some sellers who list the part on their website but don't have the product in stock. I placed an order for an autotecknic cs lip but the seller emailed me a few weeks after saying the item was OOS.

Fitment is always an issue with third party parts but from what I read the autotecknic lip is good fitment.

I also asked some Alibaba vendors and they told me they can make a dry carbon CS lip for around the same price as the above however I'm always worried about fitment with those guys. None of the "aero" parts on my car are aftermarket so I'm hesitant with starting down that route.

I'd 100% stay away from Alibaba carbon. It's a crapshoot. Go with proven aftermarket products if you're going that route.

I went with Horizon Motorsports CS v2. Fitment was fine, weave and all looked great to me vs my OEM stuff. This is my only piece of aftermarket carbon btw, i was in the same boat as you with wanting all OEM but for a high impact peice and the expense, i just couldn't rationalize it...I'm in Bucks Co PA so I know I'll be replacing this thing every couple years!

Car-Addicted wrote

I rebuilt my CS spoiler due to damage. I did the carbon fiber repair but not the PPF but it cam out as good as knew so it's possable

You stick the guard pieces on the PPF?

sycd wrote

You stick the guard pieces on the PPF?

Yes

I installed the Autotecknic CS lip last night after work, and it turned out great.

Initially, when I bought the lip and held it against the bumper while holding it flush against the center, there was a massive vertical gap — about 2 inches — between the tips of the lip and the sides of the bumper. I was so frustrated about paying the Autotecknic markup that I thought I should have just bought an Alibaba part, since at the time it felt like the fitment would have been the same.

After installing the OEM brackets (L, R, and Center), the lip sits flush against the car and I didn't bother adding the extra screws to my bumper. The lip lines up almost perfectly. Without the L, R, and Center brackets, the fitment would have turned out horribly.

When I got the lip, I had my PPF guy PPF it using a CS Lip cutout. I asked him to extend the edges so the PPF wraps around about 1cm underneath the lip. I let it cure for a few days, then applied Sliplo along the entire bottom edge of the lip. Gave it a few more days before installing. I installed Sliplo over the PPF.

One thing to note: my PPF installer noticed a few flaws in the Autotecknic lip — the front leading edge is very slightly wavy and not a completely smooth line. When you run your hand over the edge you can very slightly feel it however visually its hard to spot unless you look at the lip from certain angles.