The carbon slicktop thread

[Nate047]

Posted a scan of a US slicktop headliner here in case it's useful: https://nam3forum.com/forums/forum/m...897#post317897

Seems like the euro headliner is the same, save for that bump in the middle. If you bring that down to follow the contour of the surfaces next to it, it should be the same.

Did you think about printing one in a few smaller pieces? I feel like if you could make it slip fit and use some sort of filler to smooth out the gaps, that might work for a piece like this.

[heinzboehmer]

It can be a future project/mold if enough interested.

I also think a CF exposed headliner could be cool with matte finish

Posted a scan of a US slicktop headliner here in case it's useful: https://nam3forum.com/forums/forum/m...897#post317897

Seems like the euro headliner is the same, save for that bump in the middle. If you bring that down to follow the contour of the surfaces next to it, it should be the same.

[Slideways]

My Karb roof has developed a orange peel texture. Is the fix just getting it re-cleared or will I have to apply a layer of epoxy?

Getting it sanded flat and re-cleared is probably the only solution. I would hope that after that, the finish would stay flat and won't texture again.

The genuine E92 M3 CF roofs can have topcoat failure where the coating peels off in sheets. Shops seem to be removing the old topcoat and re-clearing those roofs.

[Gt4]

How many would be needed? Count me in.

To make a mold worth it, we need to make at least 10 parts out of it.

[DJAM3]

The topside where the clearcoat is sprayed. After some heat cycling, the clearcoat slowly goes from perfectly smooth to being textured in the pattern of the CF weave. From what I understand , they remove the part from mold, scuff it up, spray automotive clearcoat and then sand and polish.

My Karb roof has developed a orange peel texture. Is the fix just getting it re-cleared or will I have to apply a layer of epoxy?

[bavarian3]

It can be a future project/mold if enough interested.

I also think a CF exposed headliner could be cool with matte finish

How many would be needed? Count me in.

[CrookedCommie]

Any suggestions on how to rust proof some of these drilled holes?

Is it as simple as a rust-oleum rust spray? ...or is there something thicker I can apply with a brush?

Wurth brushable seam sealer might be a good option, will also kind of match the color

[Gt4]

YES. Gt4 please make some headliner blanks. Let customers upholster.

It can be a future project/mold if enough interested.

I also think a CF exposed headliner could be cool with matte finish

[Epsilon]

Any suggestions on how to rust proof some of these drilled holes?

Is it as simple as a rust-oleum rust spray? ...or is there something thicker I can apply with a brush?

[P Swayz]

YES. Gt4 please make some headliner blanks. Let customers upholster.

This!!!!

Only thing holding me back at this point...

[Epsilon]

I may have missed it, but what do you plan to do about sourcing a slicktop headliner?

I got lucky and was able to find a UK Ebay seller to ship the headliner to the US. I paid him a bit more on top of the listing price for his trouble and about $400 USD to ship to the US.

[bavarian3]

This reminds me. I have a stripped down slicktop headliner in the garage that I should 3D scan for documentation purposes. Maybe someone like Gt4 can even use the scan to start making replica headliners?

YES. Gt4 please make some headliner blanks. Let customers upholster.

[heinzboehmer]

I may have missed it, but what do you plan to do about sourcing a slicktop headliner?

This reminds me. I have a stripped down slicktop headliner in the garage that I should 3D scan for documentation purposes. Maybe someone like Gt4 can even use the scan to start making replica headliners?

[bavarian3]

FYI - I paid $2500 for the labor alone and he sourced the OEM glass from a local dealer which I also paid for. Carbon roof, new OEM seals, and roof bow were supplied by me.

I should have asked for the street car installation package instead of track car. lol

I may have missed it, but what do you plan to do about sourcing a slicktop headliner?

[bigjae46]

I recently had a carbon slicktop conversion at a popular Southern California shop. My car was transported over to the shop and I was unable to inspect the work in between or after until it was transported back. I also had my own carbon roof which was transported to the shop. I have my own headliner which I did not ask the shop to install. The shop owner was easy to reach and friendly at the time and I'll just leave it at that.

For anyone else looking into doing this, let this be a list of items to look out for.

Here are my observations after getting the car back:

*OEM Windshield is misaligned. This is visually obvious with how much gap there is on one side compared to the other (see photo).
*I see scratched paint in the side gutter of the windshield seal like a metal screw driver was used to pry it.
*New windshield seal has a 1-2mm rip
*Parts of the front and rear windshield seal edge were folded in. As simple as it sounds, I used a trim tool to lay the edges flat against the glass
*Glued on roof rail on one side is misaligned. Where the rear window seal and roof rail meet, the window seal protrudes up compared to the other side.
*Inside, there are drilled holes that are not sealed or rust protected
*I see a pried sheet metal roof panel flare out (see photo)
*I see multiple drilled through holes. Instead of drilling just enough to separate the roof panel, welds should not be drilled through.
*Although water tight from my own testing, there are internal areas where I am expecting to see glue but don't see any used.
*The trunk antennae hole was not covered and my trunk was soaked. This also caused condensation in my left taillight. I think this was during the water test for leaks. Owner told me to cover it up with a plug, but in my head I'm thinking why he didn't just tape over it in the interim if he knew about it.
*My C-pillar covers were yanked out instead of properly removed
*My rear tint was scratched up along the edges
*My roof rails were painted black, but I see dirt particles under the paint. I feel like using my nail to scratch off the dirt, but it's painted over.
*Will have more photos when I get a chance.

In short, I love the way the carbon roof looks but wish the workmanship was better.

In terms of drive, I can feel the car having less lean around street corners, but my main goal was mainly aesthetics.

Damn, that sucks. Disappointing it is a well known shop.

Looks like the underside is a unidirectional cloth? I can see the threads woven into the carbon. I wonder if they just layup up a cosmetic layer and then built it up with a unidrectional cloth which would be cheaper and faster. But I'd be a little disappointed with a $2000 roof. You want to layup the roof with a +/- 45 degree cloth to better align with the loads.