I have worked with West Systems epoxy in the past and it is a great product. To me, I would stick with what I know. If you use their 105 system, they have different hardeners if you need more work time as well which can be advantageous.
Also, as a sideline, I did look at the G-Flex mentioned above last time I was in West Marine. It doesn't state it can be used for foam so I would be inclined not to use it for my future repairs on my basement doors.
2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup