The VHB tape is only designed to have the vertical surfaces bonded. You need to "float" the top and bottom edge within some kind of molding. Once you have the molding in place you can seal the seam (at the molding)with the flexible caulk of your choosing. Also you should invest in the correct primer and make absolutely sure you have cleaned both sides properly.
You also need to develop a flat jig to rest the panel on before you bond it. Once you stick it, there is no getting it back off to straighten it.
Lastly you need to roll the seams with a roller. The tape is semi anaerobic and you have to squeeze the air out of the foam and put a certain amount of pressure on the tape.
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