This is the correct product to use if you want to seal engine cases so that they don't leak.
ThreeBond Silicone Liquid Gasket - 1211AT100
THREEBOND SILICONE LIQUID Gasket Maker Sealer Sealant 3.5oz Tube
ThreeBond 1211 Silicone Liquid Gasket Sealer 3.5 oz | TB1211 Engine Sealant
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Threebond 1215 Liquid Gasket Glue Adhesive 250g Set of 2