Aeroseal is not the only type of duct sealing. There is also duct sealing tape and mastic duct sealant. Duct sealing tape is the least expensive but also the least effective option. It is often done by DIYers but is very likely to fail.Mastic duct sealant is a sticky substance that is applied to your ducts. It hardens as it dries. Mastic duct sealant is more effective than duct sealing tape. However, it is not an appropriate solution for leaky ductwork. The best and most effective duct sealing solution is Aeroseal duct sealing.