Evo-Stik Expanding Polyurethane Foam Filler Straw 750 ml
Siroflex Expanding Foam - 300ml | Homebase
B2 Expanding PU Foam A high performance, polyurethane expanding foam.
4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit) : Amazon.co.uk: DIY & Tools