Be sure to wash and rinse the surface of the roof AND the mating surface of your brackets. Then wipe the surfaces down with rubbing alcohol and let dry.
When you put the brackets in place, put pressure against them for 20-30 seconds to release the banding agent. then let it cure for 24 hours before putting pressure on them.
If you ever want to remove the brackets, get yourself some 4" razor scraper blades. Hold one end of the blade with a vise grip and slice the tape from the side. Slice one direction only. It will take several careful passes to get all the way through. If you're careful it won't even scratch the roof. When the bracket is removed, take your thumb and rub across the tape residue and it will come off completely.
https://www.amazon.com/Replacement-S...5&sr=8-49&th=1
When I mount my brackets, I screw all of the brackets to the side of the solar panel, ready to mount. I then place the panel on the roof, exactly where I want it. Then I mark the perimeter of each bracket with a pencil. Then, I remove the brackets from the panel and "Tape" them in place, one at a time. This way you can apply enough pressure on the individual brackets.
Once the tape has cured, set you panel on the brackets and put the screws back in. Here's a pic of my panel in place. You can see the type brackets that I use and how I attached mine to my panels.
I get the brackets with those rabbit ears and drill holes for self-drilling screws.