Mill-pac, a high temperature sealant, comes in a 10.3oz caulking tube. This easy to use sealant is typically used on direct vent flex pipe to seal joints and wall penetrations where high temperatures are a factor. It's rated to 1050°F and remains flexible for a very long time to hold it's seal through the expansion and contraction of the metal components. The tube fits a standard caulking gun.
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The silicone between the glass and metal part of the fireplace front is dried out cracking and falling out. Can this be used to reseal the glass front ?
It may be, but it would be best to have a professional take a look to make sure everything is in good condition. Thanks for your question!