... used 3,Liquid 669 Hydrophilic Single Liquid Type PU Foaming AgentProduct DescriptionPu foaming agent: Single-liquid model, simple construction, hydrophilic, ... time with elasticity, it is hard to wipe and wash solution on the surface.Construction locationTunnel, cracks, basement, ceiling, ... 3 seconds and be fully expanded & solidified after mixing with water for 2 minutes.Features1.When going through ...