I need to glue carbon tubs to a fiberglass quarter panel. Also need to seal between the tubs and sheet metal and tubing. First tub is riveted in with no big gaps. Hopefully the second one turns out that way too. What product(s) should I use?

For filling gaps, my chassis builder used this.
https://www.homedepot.com/p/Lo...ck-1675273/319655245

Ive used it in a couple of places and it looks nice, and stays flexible.

Panel bond or https://timmcamis.com/product/...panel-adhesive-fast/ for bonding materials.