Soudal SOUDAFoam gap filler, 750ml, a gun grade polyurethane expanding foam filler. It has a gap filling formulation with high 3D expansion, and it is a one component foam that is easy to use and cures rapidly. It offers excellent thermal and acoustic insulation properties, and bonds without a primer on most construction materials. The can is equipped with a DuraValve for improved yield and performance. Use it with a foam gun applicator and follow the manufacturer's instructions on the can. Always wear suitable eye and hand protection when working with expanding foam.