Injecting 2-part flotation foam.

[phorvati]

I am looking for marine closed cell flotation foam that can be injected (Not poured).
I used 2 part closed cell foam to insulate bricks and walls in my basement. Gun allows pressurized containers to mix in equal parts and you can inject it into vertical cracks or spray it.
https://www.amazon.com/Foam-602-Clas.../dp/B00597CCUU

Closed cell flotation foam like the one from total boat
https://www.amazon.com/TotalBoat-Ure.../dp/B01AAP3G9Q
does not come pressurized so you need gravity to do the filling.

They are both closed cell polyurethane foams. I tried looking up the contents of what makes total boat marine vs. this other stuff but could not find any useful info.
Has anyone figured out a way to make it injectable? I'd like to be able to have it fill the voids in my portlights once glass is sealed and bronze frame is installed. See below.

[Tailwheel]

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