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BOSS 139 Hi-Temp Mortar – 10 oz. Tube
BOSS 139 Hi-Temp Mortar – 10 oz. Tube

Boss 139 Hi-Temp Mortar is built for application in high-temperature areas, such as chimneys, fireplaces, appliances, stoves, wood and more. Apply it using a standard caulking gun. Once dried and cured, it is rock hard. It is safe to use and … Read More

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Boss 812 Fire Block Foam
Boss 812 Fire Block Foam

Boss 812 Fire Block foam – smoke stop with insulation and acoustic properties.  Tested as ASTM E-84 classified Class A.  12 oz.

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