{"product_id":"threebond-rtv-silicone-gasket-sealant-tb1215-gray-paste-oil-resistant-flexible-seal-for-engines-gearboxes","title":"ThreeBond RTV Silicone Gasket Sealant TB1215 — Gray Paste, Oil-Resistant Flexible Seal for Engines \u0026 Gearboxes","description":"\u003cp\u003e\u003cstrong\u003eThreeBond TB1215 is a gray, paste-like RTV silicone liquid gasket that forms a flexible, oil-resistant seal between metal mating surfaces when exposed to air.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for assemblies where no preformed gasket is used, this room-temperature-vulcanizing (RTV) sealant creates an elastic joint that resists gear oils and prevents leaks in demanding industrial and automotive settings. Its non-sag paste consistency allows application on vertical or inverted faces, making it practical for engine cases, pump housings, gearboxes and other equipment joints.\u003c\/p\u003e\n\n\u003ch3\u003eHow does TB1215 form a seal on engine and gearbox casings?\u003c\/h3\u003e\n\u003cp\u003eWhen applied to clean mating metal surfaces, TB1215 cures by reacting with moisture in the air to become an elastic rubber-like bead that fills irregularities and gaps. The cured material bonds to metal and remains flexible to accommodate vibration and thermal expansion without losing adhesion.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eApplies as a non-drip paste for easy placement on vertical joints\u003c\/li\u003e\n  \u003cli\u003eCures at room temperature to a resilient silicone elastomer\u003c\/li\u003e\n  \u003cli\u003eSeals uneven surfaces and prevents fluid migration through joints\u003c\/li\u003e\n  \u003cli\u003eGray color helps visibility during inspection and assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat equipment and industries is this sealer suitable for?\u003c\/h3\u003e\n\u003cp\u003eTB1215 is formulated for heavy-duty uses including marine, construction machinery, automotive repair, agricultural equipment, power generation and general industrial production. It is especially useful where conventional pre-cut gaskets are impractical or where a custom-fit seal is required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngine and transmission casings in vehicles and machinery\u003c\/li\u003e\n  \u003cli\u003ePumps, gearboxes, and housings subject to gear oil contact\u003c\/li\u003e\n  \u003cli\u003eShipbuilding and offshore equipment with sealed joints\u003c\/li\u003e\n  \u003cli\u003eManufacturing lines requiring dependable joint sealing solutions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I prepare surfaces and apply the liquid gasket for best results?\u003c\/h3\u003e\n\u003cp\u003eSurface preparation is critical: remove old gasket material, oil, and contaminants then dry the surfaces thoroughly. Apply an even bead where the joint mates, assemble within the recommended open time, and allow full cure before introducing fluids or pressure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eClean surfaces with solvent and scrape away residue\u003c\/li\u003e\n  \u003cli\u003eApply continuous bead sized to joint gap and bolt pitch\u003c\/li\u003e\n  \u003cli\u003eTighten parts per manufacturer torque while sealant is tacky\u003c\/li\u003e\n  \u003cli\u003eAllow complete room-temperature cure before testing or operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance traits and limitations should I expect?\u003c\/h3\u003e\n\u003cp\u003eTB1215 provides strong resistance against gear oils and retains elasticity under vibration; however, like all RT V silicones it requires proper curing time and is not intended as a structural adhesive. Its paste-like, non-sag nature improves application control but thickness and joint design affect cure speed.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eExcellent resistance to petroleum-based gear oils\u003c\/li\u003e\n  \u003cli\u003eNon-sag paste allows vertical or overhead application\u003c\/li\u003e\n  \u003cli\u003eNot a substitute for mechanical fasteners or load-bearing joints\u003c\/li\u003e\n  \u003cli\u003eAmbient moisture and temperature influence cure rate\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? TB1215 is aimed at technicians, mechanics, shipfitters and maintenance engineers who need a reliable, oil-resistant liquid gasket for engine cases, transmissions and industrial housings where a custom, flexible seal is required. It is also suitable for fabrication and repair shops that want a non-drip, easy-to-apply sealant to replace or complement conventional gaskets.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can TB1215 withstand gear oil exposure?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. TB1215 is formulated for strong resistance to gear and petroleum oils when fully cured.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need special tools to apply this sealer?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No special tools are required; use a standard caulking gun or spatula for accurate bead placement.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ThreeBond","offers":[{"title":"Default Title","offer_id":48086791192734,"sku":"B000TGHCZG","price":62.15,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/threebond-tb1215-front-packaging.jpg?v=1785905306","url":"https:\/\/northtrailauto.ca\/products\/threebond-rtv-silicone-gasket-sealant-tb1215-gray-paste-oil-resistant-flexible-seal-for-engines-gearboxes","provider":"North Trail Auto","version":"1.0","type":"link"}