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Theirs no one answer to your question, it would b EZ"er to answer one question at a time. No one rule applies to one type of gasket, most professionals learn by the school of hard knocks (from what werked and what did not werk and by how much time it cost them) Some one had a leak-er on a 302 a week or so ago, theirs 3 or 4 different gaskets that will werk and depends on how its installed on how well it seals. I will start with a cork gasket used on a tin cover (valve cover- front timing cover- valley pan etc) Do not put enny thing on cork that will make it slippery, The cork will squeeze out and break when you tighten the cover down. . Its ok to put silicon on joints but not on all the cork gasket. I glue 1 side with 3M 8001 adhesive, seal joints with black or gray silicon. Reason I use 3M 8001 izz to hold the gasket in place during instillation, it also needs a few min. to set up and depends on temperature, hot it sets up fast cold may need 5 min to set up. It izz tempting to install with out adhesive and may werk with out enny problems were you are at cuzz the gasket does not werk in a environment were their are positive or negative presser like were gaskets have to live on a engine. Cork will live a long time if it izz not affected by heat. Were heat izz a problem I had rather use a good silicon. Make sure yet sealing surface izz "flat and clean" as possible. I have my reasons as to why I glue it down, one would B I had to pull a engine to replace the oil pan, valley pan gasket cuzz it blew out on a 440 Chrysler. I don"t think it would have happen if i would have glued one side with 3M 8001 adhesive. Example-- Farmall 113/123 timing cover its tin and not flat. Beat out straight as possible git x-tra clean and seal with gray RTV, use no gasket. You could use black RTV like Permatex "The right stuff" but not Permatex black RTV out of the cheese cans that"s not labeled "The right stuf" its not the same and not a good RTV yo use. The Gray RTV silicon sealer izz far superior than enny other I have used but not as good as "The Right Stuff" (TRS). So why not use TRS all the time. Once opened TRS has a shelf life of a week may B. So I kin not afford to wast $15.00 to seal a one time job were the gray silicon will do as well. But theirs covers that I will go the extra mile to seal with TRS. If I plan to use RTV and not a gasket and its in a place I kin not git clean I perfer to use the gasket, RTV has to have a X-tra clean surface or its a wast of time.
The use of RTV depends on the location were you plan to use it, its a different question and needs to B answered in a different post.
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