We have been involved in many projects using our foams for various purposes in the marine industry, ranging from its use as a lightweight closed cell filler in pontoons to insulation in house boats. Due to the closed cell nature of our spray foams, they do not absorb moisture, so will not become waterlogged, even if exposed to water consistently, or submerged.
Similar to its use as an insulation material in container homes, using spray foam on metal surfaces prevents condensation from occurring, which in turn prevents corrosion and mould from causing damage.