The temperature usage range for Duct Seal is 25 to 120 degrees F and it has a tolerance range of -30 to 175 degrees F. This means the Duct Seal should be applied between 25 to 120 degrees F. Duct Seal is used and designed primarily to plug holes around conduit mostly inside buildings but is also used outside on service entries. There is a tendency to dry on the surface when exposed to weather. There is material in these locations that are dry but still maintain a seal after 20 years. As far as use in vehicles, there shouldn’t be a problem unless the vibration causes the material to not adhere to the surface.
Duct Seal is resistant to gas vapors however, if condensation of gases occurs then it becomes an issue. Liquid gases contacting duct seal can soften the material. Gases themselves are not the problem but liquid formed by condensation over extended periods could be an issue. Duct Seal is not meant to be used outdoors.
Duct Sealing Compound is a gray, permanently soft, non-toxic compound
which will adhere to most clean dry surfaces. Duct Sealing Compound
will not adversely affect other plastic materials or corrode metals.
It also has no adverse effect to human skin.
There is a Duct Seal specification sheet located on our website under the resources tab that contains all of the products information. It is also listed in our catalog on page 169.