Okey Dokey pops, young buck to the RescueI never could sort out when you should use red, bue, or black. Help pops out here, Nick.
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I decided I would crack out the text book and give you and exact answer, I must say it makes a great book end, but it makes a better resource sometimes.
On the subject of Anerobic sealers "They are used only on precision machined parts" Pg. 909 Automotive Service 4th edition.
On to RTV's.
"it is an Aerobic sealer. It is never to be used around Fuel, as Gasoline breaks down Silicone."
"High Temperature RTV Silicone is often red in color, and this is due to the addition of Iron Oxides."
"Low Volatile RTV is Sensor safe,it however takes longer to cure and is usually Blue in color"
Black has somewhat become the all purpose silicone, years ago the blue was the only sensor safe silicone, but now it comes in black as well, however the Black, grey, white is still usually the generic or multipurpose stuff, Red/ orange is almost always the high temp silicone.
I hope this makes any sense at all.
Nick