Chris, I found that besides the right adhesive for the dash, I also needed good clamping and holding force to get the dash cap ( aftermarket dash cover) to sit down right. First off, I didn't use the generic silicon that came in the kit. I used a 24 hour setting epoxy.
Clamps were used , and I made 2 wooden supports (L and R) that simply wedged into the door frame and pushed down on the dashcap. The next day after all the clamps came off, the dash was perfect--and hasn't lifted since.
I meant to keep the wooden supports...but the gardener pitched them
Marty