Mid-size accessories like add-on spoilers on trunk lids, or other exterior styling pieces are frequently attached with adhesive.
A larger component commonly attached with adhesives are the rear fender flares on dually pickups. Very commonly these are built with a standard bed, and then the flares to cover the extra wheel width are applied with a 3M VHB-like adhesive strip.
But like anything, there is a way to do it properly, and a way to do it hacky.
Most plastic body panels are held on with conformal clips. But they couldn't do that with the metal panels of the cyber truck nor did they want visible fasteners so glue is the only option.
Glue isn't ideal because the part has to be clamped in place while the glue cures which is slow, and quality control is tough because you're doing a little chemistry experiment on your assembly line hundreds of times per day.
Normal cars have this problem with paint and quality control with paint is such a big deal that it has its own separate production line just for painting stuff pre or post assembly
Using composite panels is very uncommon in production vehicles and when they are used (for looks) traditional fasteners are used during assembly often with threaded inserts embedded in the composite panel during manufacture
Glue is uncommon in most cases, particularly for body-panel mounted things like the examples I gave. Adhesive-mounted components are common, to various degrees.
Glass-mounted items are commonly glued, the most prevalent one being the knob for the rear view mirror. And "prevalent" here means "99% of anything mounted to glass in a vehicle"
Tesla is using BETASEAL [0], which is designed for adhering to glass. I'm not sure what kind of weight rating BETASEAL is approved for, it is commonly used for other applications where a decent degree of strength is expected.
[0] https://www.dupont.com/content/dam/dupont/amer/us/en/mobilit...
Perhaps it's about minimizing the installation cost at the dealership.
The irony is that you'd imagine that an off-road roof mounted light would be something that you should be able to tighten when you are ... off-road.
I guess field serviceability isn't a design goal for these "off-road" trucks, but appearing "off-road" when going glamping is.
There just isn't a lot of options other than adhesive for installing a light bar considering the windshield consumes all of the forward facing real estate (as the roof slopes back from the apex).
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Perhaps this is something that Slate can solve better than Tesla.
Tesla just doesn't have a good record with adhesives.
I think the adhesives will release with heat but honestly I'm not sure how body work is done on those.
For car companies, no.
But as Tesla reminds us constantly, they're not a car company, they're a robotics / AI company. Those generally focus less on how to build cars.
Yes. If automotive OEMs can glue it they will.
It's just that other OEMs don't build uninterrupted 5ft light bars so glueing is a much less suitable (think about how much glue contact patch per amount of light bar there is and how little leverage it's mass has over the glue, contrast with normal light) solution for them.
I think if you did the glue joint perfectly then it would probably be fine, but impeccable QC is not a hallmark of Tesla.
Is that typical in the industry, parts or components being glued onto an exterior surface instead of fastened?