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      03-30-2020, 09:29 AM   #1
FrozenGT
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Help!!! BMW M -Performance Rear CF LIP- Ends leave a Gap

Hey guys-

Super annoyed right now what is the best 3M tape that I should use looks like I might have to reinstall the spoiler I do not want to use any type of case of interest permanently bonding the carbon fiber to the truck
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      03-30-2020, 12:44 PM   #2
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Quote:
Originally Posted by FrozenGT View Post
Hey guys-

Super annoyed right now what is the best 3M tape that I should use looks like I might have to reinstall the spoiler I do not want to use any type of case of interest permanently bonding the carbon fiber to the truck
This has come up a few times before on here and I came across the threads when doing my spoiler. There seem to be a few options.

1. Did you align it correctly? If not aligned perfectly then it may not contour to the shape of the trunk well

2. Did you buy new and use the tape it came with? Some people add the 3M tape to the edges to make sure it sticks (3M VHB 5952 is what I used, they have different thicknesses) - I also used a heat gun to get it hot and clamps at the edges for 24 hours to get it to hold.

3. Some people use a bonding agent or adhesive promoter, this seems like overkill to me and good luck getting it off if you ever want to in the future.

4. In some cases, the spoiler is simply a bad batch and not curved properly to match up to the trunk. Some people have had luck ordering a new one - this has not been unique to BMW other aftermarket "high end" spoilers have had variation between batches.

Good luck, I hated this install - get the 3M eraser wheel if you need to get off adhesive.
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      03-30-2020, 03:35 PM   #3
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Quote:
Originally Posted by FrozenGT View Post
Hey guys-

Super annoyed right now what is the best 3M tape that I should use looks like I might have to reinstall the spoiler I do not want to use any type of case of interest permanently bonding the carbon fiber to the truck
I wanted my spoiler perfect, but there was 1/64" gap on each end. Most people would never see it, I will.

Solution. In addition to prep and 3m high strength autoBody tape. I used 100% black silicon and a syringe and squirted a tiny bead under the ends. I then clamped down the ends of the spoiler to the car with rubber ended tension clamps. After this, I cleaned any silicon that came out. (Almost none). Let it dry for a few days.

Perfect fit and finish and zero gap on the ends.

You can also do the same application with small amounts of betalink, but silicon is easy to cut with dental floss for removal later.

As @mosely said, many of these spoilers don't fit perfectly. Either it's the truck lid or spoiler, who knows. I figure the spoiler since the lids are stamped out.
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      03-30-2020, 04:27 PM   #4
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Quote:
Originally Posted by FrozenGT View Post
Hey guys-

Super annoyed right now what is the best 3M tape that I should use looks like I might have to reinstall the spoiler I do not want to use any type of case of interest permanently bonding the carbon fiber to the truck
Updated to include all details:

I installed the rear spoiler lip last week. It did not quite sit perfectly flat on its own and the general consensus is that it is a hand made part that is not always perfect but should generally fit the body contours when placed correctly.

I added extra 3M Super Strength Molding tape (3M 03609) to only the ends of the spoiler which are notorious for lifting on a surface that is not perfectly prepped. I wiped the mating surface of the CF spoiler with rubbing alcohol and prepped with 3M Automotive Adhesion Promoter (3M 06396). I have a heated garage but I used a hair dryer to warm up the parts even more just to assist.

I cleaned the trunk surface by claying and compounding then a simple detergent wash and wipe with rubbing alcohol. I applied the 3M Automotive Adhesion Promoter on the trunk surface then warmed up the trunk surface with the hair dryer. I placed the spoiler and pressed down all along the portion that had tape. I then lay towels over the area and set bottles of windshield washer fluid and coolant across the area (especially the ends) and let sit overnight. I came back the next morning and wiped any adhesion promoter away with the rubbing alcohol.

The spoiler lip is super solid now. I think the adhesive promoter was a key step.
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Last edited by Cannondale900; 03-30-2020 at 05:23 PM..
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      03-30-2020, 06:12 PM   #5
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Quote:
Originally Posted by Cannondale900 View Post
Quote:
Originally Posted by FrozenGT View Post
Hey guys-

Super annoyed right now what is the best 3M tape that I should use looks like I might have to reinstall the spoiler I do not want to use any type of case of interest permanently bonding the carbon fiber to the truck
Updated to include all details:

I installed the rear spoiler lip last week. It did not quite sit perfectly flat on its own and the general consensus is that it is a hand made part that is not always perfect but should generally fit the body contours when placed correctly.

I added extra 3M Super Strength Molding tape (3M 03609) to only the ends of the spoiler which are notorious for lifting on a surface that is not perfectly prepped. I wiped the mating surface of the CF spoiler with rubbing alcohol and prepped with 3M Automotive Adhesion Promoter (3M 06396). I have a heated garage but I used a hair dryer to warm up the parts even more just to assist.

I cleaned the trunk surface by claying and compounding then a simple detergent wash and wipe with rubbing alcohol. I applied the 3M Automotive Adhesion Promoter on the trunk surface then warmed up the trunk surface with the hair dryer. I placed the spoiler and pressed down all along the portion that had tape. I then lay towels over the area and set bottles of windshield washer fluid and coolant across the area (especially the ends) and let sit overnight. I came back the next morning and wiped any adhesion promoter away with the rubbing alcohol.

The spoiler lip is super solid now. I think the adhesive promoter was a key step.
Good Stuff!! Thank you. I just ordered some 3M and the promoter. Will update everyone soon.

I also did what you did I machine polish the finish on the trunk got it perfect and then installed it from there.
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      03-30-2020, 10:13 PM   #6
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Quote:
Originally Posted by Cannondale900 View Post
Updated to include all details:

I installed the rear spoiler lip last week. It did not quite sit perfectly flat on its own and the general consensus is that it is a hand made part that is not always perfect but should generally fit the body contours when placed correctly.

I added extra 3M Super Strength Molding tape (3M 03609) to only the ends of the spoiler which are notorious for lifting on a surface that is not perfectly prepped. I wiped the mating surface of the CF spoiler with rubbing alcohol and prepped with 3M Automotive Adhesion Promoter (3M 06396). I have a heated garage but I used a hair dryer to warm up the parts even more just to assist.

I cleaned the trunk surface by claying and compounding then a simple detergent wash and wipe with rubbing alcohol. I applied the 3M Automotive Adhesion Promoter on the trunk surface then warmed up the trunk surface with the hair dryer. I placed the spoiler and pressed down all along the portion that had tape. I then lay towels over the area and set bottles of windshield washer fluid and coolant across the area (especially the ends) and let sit overnight. I came back the next morning and wiped any adhesion promoter away with the rubbing alcohol.

The spoiler lip is super solid now. I think the adhesive promoter was a key step.
Wheels are fantastic! Please??

https://ind-distribution.com/collect...lector-inserts
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      03-31-2020, 10:06 AM   #7
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Quote:
Originally Posted by FrozenGT View Post
Hey guys-

Super annoyed right now what is the best 3M tape that I should use looks like I might have to reinstall the spoiler I do not want to use any type of case of interest permanently bonding the carbon fiber to the truck
Sorry to hear that. I had several CF trunklid spoilers in the past and they all did this. Drove me nuts. That's why for my M2C, I'm not doing one.

It is surprising, however, to hear that the M Perf CF trunklid spoiler, which is basically OEM, does this.
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