Use 3M VHB tape, clean the surfaces thoroughly with alcohol and then prime both surfaces with 3M Primer 94.
Position spoiler on boot and use strips of masking tape to keep the front edge in place then start peeling the tape backing from under the spoiler, with the spoiler still in the correct position. Then press down hard along the whole length of the spoiler, then either place weights or use tape to hold spoiler down for a couple of hours to allow the tape to fully bond.
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