Best way for flotation on new boat build?

[Varooom]

Building (assembling) a new V-hull 33" boat. I have always used pool noodles cut to fit for flotation. Would like to know if there is a better or different way?

Thanks for your time,
Varooom

[BUMBLESPECIMOODA]

I recently used 2-part expanding foam, in a current build. I used the "Fibreglass Supply Depot" brand. Make sure the cavity is open, or the foam expanstion can break apart the hull. Pour small portions at a time. It sands well too.

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[Addicted]

2 Lb Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (Quart Kit): Amazon.com: Industrial & Scientific

[CJPB32]

I recently checked the added flotation in my Impulse 32.... I flipped it when I hit a large wake.
I felt inside the bow, behind the bulk head after removing the flex shaft when I got home (the normal after run maintenance). I felt wetness.
When new, I had stuffed the bow with some white, closed cell foam I had laying around (no idea where it came from) and some "regular" green pool noodle from the kids.
The noodle had water trapped in it. Not a lot; but some water dripped out when I squeezed it.
Maybe it would have dried sitting on my table during the week with the hatch off. IDK. But I'm not using pool noodle anymore.

[DeltaAPmech]

I used regular styrofoam cut with a hotwire to fit tightly into every space that wasn't needed for running gear
I have it in a jetboat that has seen many dunkings and it never has absorbed any water.
The pour foam seems better because it gets into every space and adds to the strength of the model but I was to cheap to go that route. I already had the styrofoam lying around
Pete