IDEALĀ® Duct Seal is the professional's choice for protecting electrical installations. This versatile, non-toxic compound remains permanently soft, making it perfect for sealing around junction boxes, flashings, and service entrances. It can be painted immediately after application and won't corrode metals or adversely affect plastic materials. UL Listed, this dark gray putty is easy to apply and provides an effective moisture and air barrier, ensuring long-lasting durability.Seals around junction boxes, flashings, masonry and service entrancesProvides a moisture and air barrier for long lasting protectionPermanently soft, non-toxic compoundCan be painted immediately after applicationWon't adversely affect plastic materials or corrode metals 31-601 DUCTSEAL 1lb/PK IDEAL