Fix for CFRB delamination
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Thanks for producing and sharing this video!
Why would the aftermarket products that you applied not degrade as rapidly as the coating applied by BMW? CFRP roof delimitation has been a problem with BMW M cars and i3's for years, so wouldn't BMW have changed what they used for a more durable coating if one existed?
Why would the aftermarket products that you applied not degrade as rapidly as the coating applied by BMW? CFRP roof delimitation has been a problem with BMW M cars and i3's for years, so wouldn't BMW have changed what they used for a more durable coating if one existed?
Most likely manufacturing and material costs. The layer of epoxy is pretty thick, and it does not matter how good your process is, you are talking about at least 1 hour cure. BMW CF manufacturing process is famous for only taking 2 minutes, and part of their secret is that the layer of resin (epoxy) is pretty thin.
I have worked in the automotive, aviation and aerospace industry, and the problem is always the same; they probably thought they could get away with it.
No, a thick layer of epoxy as the one I put, with a high quality clearcoat, everything UV rated, will certainly outlast the rest of the vehicle.
Mine's in dire need too. I'm strongly considering going this DIY route and also appreciate the repair video. I've seen others out there too. If I do go this route, I was thinking that it would be nice to layup a black CF weave in the process to give the roof an improved M3-like look. I'm a newb on this type of work, but game for a challenge. Anyone have experience or thoughts?
If I were living in Florida, I'd avoid black and go with a light-colored vinyl film or, even more durable, paint. The cabin temperature difference is noticeable when the roof is in direct sunlight. I was told by shops that wrap vehicles here in Honolulu (very intense sunlight) not to expect vinyl film to last more than 2 years on the roof if the roof is exposed to direct sunlight much of the time.
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jessherbie
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I have this problem too. I would like to know if anyone has a recommendation for a local repair shop that will do good work. I live in the San Francisco Bay area. Thank you.
Points well taken. I've certainly considered the wrap option, which seems to be the consensus solution. However, the prep required for it, or for paint for that matter, is almost as involved as the epoxy layup, but there are a lot more shops out there to do them. Clearly, UV is the culprit and cabin heat is an issue, but I drive very little and will keep it garaged. The CF weave looks so much better than the original scrap CF used. A gray CF weave, to match my exterior may be a fair compromise, with UV resistant resin or an additive. The convexity of the roof, and the setting time with laying up a large piece, seem to be the issues making it difficult to do well. I might try to find a marine fiberglass repair place that might tackle it, if the DIY is too daunting.
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