Residential Window Sealant Helps Keep Wind and Water Out A durable, flexible seal around windows and doors helps prevent water and air intrusion, and makes homes more durable and energy efficient. DuPont™ Residential Sealant is a durable, highly flexible window sealant for use in general residential construction. It is formulated to bond well with DuPont™ Tyvek®, weather barriers, and other DuPont construction products, as well as most common building materials. As an integral part of a complete building envelope system, DuPont™ Residential Sealant helps control both air and water intrusion, to help make homes more comfortable, prevent water damage, and reduce heating and cooling costs.