Fitted my carbon pro rear spoiler myself this weekend, and in the end, i did use the Betalink. It looks perfect, and is rock solid. The only issue i had, was the Betalink started oozing out, over the top of the nozzle like a volcano erupting, and i admittedly panicked a little, and started putting it onto the spoiler with my fingers. Big mistake, this stuff is like black tar, i cant get it off my hands yet. But the job is perfect, so im pretty stoked.
So if i did it again, i would tape the tube of Betalink into the supplied nozzle, and not panic as much, or dab it on with a coffee stirrer stick ?.