I just did a search for what I used and it comes up under structural adhesive not panel adhesive.

3M 8101 is what I used.

I've used the 08115 but it needs a special applicator caulking gun and was a pain to use since I didn't have one but would work.
The 8101 is 2 tubes you mix 1:1 like filler (if you had filler that mixed 1:1)

Give me ambiguity
or give me something else