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Been using 3m tape and been holding strong for me too, from temperatures of -40celsius to +30celcius for nearly two years.
I did however clean the area before taping on and recommend the same. I added the tape to the spoiler first and cut grooves in the tape to make it concave and follow the line of the spoiler. This also made sure no air pockets were created as the tape did not have to bend or fold up anywhere then I placed it on the truck lid. I also rounded off the edges of the tape so it would not stick out at the ends
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