With plastic as thin as I was using, it was really easy to burn holes through the plastic if I heated up a spot for just a split second too long. I found if the plastic does not pull as tightly over some parts as you would like (either because the plastic was not heated enough in that spot, or because the vacuum is not strong enough), you can heat it up some more with the heat gun as the vacuum is still running.
Make sure to bring the frame straight down rather than from the side, or you may stretch parts of the plastic and cause it to tear. The plastic will stretch as it lays over the objects when the frame touches the platen and creates a seal, the vacuum will be able to suck the plastic tightly over the pieces. When the Sintra is fully heated, turn on the vacuum cleaner and place the plastic over your objects onto the platen. (While writing this Instructable, I also learned that Sintra can be softened by submerging it in boiling water for 10 to 15 seconds, which seems like it would heat it more evenly). I clamped it inside the frame and heated it up with my heat gun for a few minutes until the whole piece was very flexible. I was using some Sintra plastic (expanded PVC) for my vacuum forming I had left over from a few years ago. I grabbed some random objects and arranged them on the platen.
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