... stopping up holes. Good sound-proof and elec Product descriptionCOST-1260 is a one part, polyurethane elastic filling sealant material. It ... materials etc.*Excellent flexibility, no cracking after curing of COST-1260 foam.*Non-toxic, non-polluted, it’s an excellent environmentally ... 50%RH, it can be kept 9-12 months. COST-1260 Polyurethane Foam