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, with care. Calculate the internal volume, and make sure the cavity is dry and sealed. The foam only flows a few feet before it expands, so for long, narrow spaces, over 5 feet long or under 2 inches across, results vary and you should test first. See our full guide on filling pontoons with foam.