Help! What Sealant is Better than Dow 795 for polycarbonate??

[Chotu]

Can anyone suggest a sealant better than Dow 795? I have large poly carbonate windows that move about an eighth of an inch each day due to heat. They have VHB tape holding them in place. That is working. But they also need to be sealed around the edges. And everything is cracking. Doubt 795 is failing. What is a more soft and supple type of sealant? One that will move with the window.