GREAT STUFF™ Insulating Foam Sealants seal air leaks easily, inexpensively and permanently. Packaged with an easy-to-use straw, GREAT STUFF™ Insulating Foam Sealants fill pipe penetrations, gaps in the structure where two building materials meet, and any space that allows air to enter or leave the home's envelope. There are five formulations of GREAT STUFF™ Sealants: Gaps & CracksBig Gap FillerWindow & DoorFireblockPestblock, and Pond & Stone. GREAT STUFF™ Insulating Foam Sealants bond to wood, metal, masonry, glass and most plastics.