I am French and I do not speak English. I hope Google translate for me okay.
While Mike was fighting with the snow and could not deliver me, I built a "vta minimum."
I cut a sheet of Dibon, and I stuck on an aluminum frame.
Prior to the Sylgard, I used a primer for silicone in the corners and around the window.
Sylgard does not tear and it does not bubble. Do not put a lot of primary because it will be able to change the Sylgard without breaking everything.