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I glued one warped end of the dashboard with the same glue about two years ago, and it still holds (always parking outside in the sun). There are two small bumps which came up again, but this is visible through the windshield only (I don't care).
I just glued my warped dashbord. When it's hot and sunny and the car is parked in the sun, the dashbord gets quite soft. I used a heat gun in addition and it got very easy to push it down. I used Aquaseal, which is an urethane glue (pls see below). To get the glue underneath the dashboard I used a syringe with a thick bent needle. When the glue is warm, it gets very fluid and can be pushed through the needle. Letting the tube sit in the sun for a few minutes is sufficient. The heat gun can be used to heat the glue up more, especially the glue in needle.
