Dave
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Here is the data sheet for the Silicone product you used. Notice the comment about not using it for contact with gasoline.
PRODUCT DESCRIPTION: Mega Black Silicone is a single component, moisture curing RTV (room temperature vulcanicizing) silicone gasketing material that cures into a strong silicone rubber that maintains long term durability and flexibility to make formed-in-place gaskets. Mega Black Silicone is a non-slumping, paste-like consistency which cures when exposed to moisture in the air. Forms a tough, flexible silicone rubber gasket that resists aging, weathering; will not harden, shrink or crack. Remains more flexible than conventional gaskets. Mega Black Silicone is non-corrosive to steel, iron and aluminum. WORKS BEST ON: Use to replace silicone, cork, felt and rubber gaskets. Use on valve covers, oil pans, intake manifold end seals, water pumps, transmission pans, cam covers and thermostat housings. (OEM Approved = Original Equipment Manufacturer Approved) PRODUCT FEATURES: Tensile Strength: 240psi Non-Flammable, Non-Toxic Low Volatile, Oxygen Sensor Safe Low Odor Color: Black Waterproof Set Time: 8 – 10 minutes Full Bond: 12 – 24 hours (Cure times will vary with temperature, humidity and gap) Temperature Range: Continuous: -65ºF to 400ºF Intermittent: -65ºF to 650ºF Chemical Solvent Resistance: automotive fluids and oils Mega Black will handle synthetic oils; but NOT IF FRICTION MODIFIERS (ADDITIVES) ARE ADDED TO THE OIL. NOT RECOMMENDED for use on parts in constant contact with gasoline. Storage: Store in a cool, dry environment. SURFACE PREPARATION: PROVIDE ADEQUATE VENTILATION. Protect work area from accidental spills. Clean all mating surfaces with a residue-free solvent to remove grease, oil, dirt or other contaminants. REMOVAL METHODS: (test inconspicuous area of item to be sure chemicals do not harm surface) Before cure: Scrape off excess with a knife or non-flammable cleaning fluid. If skinned over, break film with a dry cloth and remove as much as possible. Remove any remaining material with a gasket remover. After cure: Scrape or peel off, then solvent clean surface. HELPFUL HINTS: Clean and dry surfaces thoroughly. Apply a thin even bead (1/8”) to one surface. Wait 10 minutes until sealant skins before assembling. For temporary assemblies, apply a light coat of oil to uncoated surfaces, then assemble. Clean excess with a knife. Replace cap after use. Sealant is fully cured in 12-24 hours. This product is not recommended for use in pure oxygen or oxygen rich systems and should not be used as a sealant for chlorine or other strong oxidizing materials. For storage: after use, create a silicone plug by pushing excess material to extend beyond the extension nozzzle and allow to cure (this will seal and protect unused product). To reuse, simply remove the cured “plug” from tip. See MSDS for more complete information, safe handling instructions and first aid. Non-Regulated Part Number: 99839, 99849
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