Will this foam cure in an enclosed space? In other words, does it need to be exposed to air in order to properly cure?

Thank you for the question, Luke. The OSI QUAD Foam does require exposure to air to cure properly. This product is designed to fill gap, cracks, and holes commonly found around the home but only if the areas that are completely exposed during the application phase such as installing windows. Attempting to fill blind cavities or enclosed spaces that are not fully accessible with these types of foams generally does not work and the end results are typically hollow spots that did not cure properly due to suffocation.