UPDATE: Based on feedback from this site and a few forums, It is recommended that you make sure there is some thin cloth between the magnet and your car paint, as it will aggressively scratch the finish. This was originally made for a car that was going to be painted later.
I would use a thin enough cloth that won't compromise the strength of the magnet, but protects the paint.
You could use some light spray adhesive like super 77 to attach. Just make sure to trim the cloth to only be a little larger than the magnet to not get it in any shots.
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The Bonneville Salt Flats have held an appeal to gearheads for nearly a century, the highlight of which is the annual "Speedweek" held in the month of August. For the past 3 years two good friends of mine have made the journey from Minnesota to Utah in a unique vehicle they built by hand, with each year adding to the already colorful history that they've created. This year is no different with the year's car being a completely rebuilt-for-racing 66' Coronet.
They recently decided that this year they were going to bring along a "GoPro Hero II" and attempt to capture some of the shenanigans that would undoubtedly ensue. A few days ago, they approached me to design and create several camera mounts and plan out several shots to add interest to their video. Overall we created three different mounts: A fender mount, a roll cage mount, and as seen in this instructable... a magnetic hood-and-roof mount.
As with all the mounts we created, versatility is key. We created the magnet mount with the idea that we will be moving the position from the hood to the roof to the trunk to wherever (that is vertical).
We were inspired by a few GoPro car videos, primarily "Drift Battle 2" and Ken Block's "Gymkhana five". It's worth checking both of these out whether or not you intend to build this mount. They are amazing videos.
Fun Fact! I took all of the photos for this 'ible with a GoPro!
I only have photos of immediately after I created the mount, but will upload photos of the mounts attached to the coronet soon