Expanding urethane pour foam is a two-part, closed-cell liquid foam system that expands rapidly when mixed. It's used for flotation, insulation, soundproofing, and filling voids in boat hulls, decks, and other marine structures.

Yes. You can pour in multiple layers, waiting 15–20 minutes between pours. This method helps control expansion and ensures complete curing without overheating.

Yes, but with caution. You’ll need to calculate the internal volume of the space and ensure it’s dry and sealed. For pipes or long, narrow cavities, be aware that foam only flows a few feet before expanding. For anything over 5 feet in length or under 2" diameter, results may vary—test beforehand. Read the full post on how to fill your pontoons with foam