Big Gap Filler is a triple expanding foam sealant, fills gaps larger than 1 inch. So it's great for creating larger weather-tight seals to stop drafts and keep critters out. Plus, like all Great Stuff products, it's airtight, paintable, stainable and sand-able. It's polyurethane-based and perfect for all sorts of materials like wood, drywall, metal, masonry, glass and most plastics.