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MG MGB Technical - gasket sealers

When do you you use gasket sealers such as silicone, and liquid sealers and when do you trust just the gasket? I know from my youth that inpsection parts such as valve covers only get sealed on one side but what is the general consensus? Thanks-k
Keith Yarbrough(TD 1275)

I hate silicone. Where people have used a bead as thick as shown on the packaging it oozes out all over the place and if internal can block small passageways. If you use a thin smear then unless the part is very small it dries very quickly and doesn't seal anyway.

I use Hermetite Red which is non-setting, and just a smear both sides of the gasket. For rocker covers the usual method is to glue the gasket into the cover, then use a non-setting sealant or even just grease on the other face.
PaulH Solihull

I have become a convert to Wellseal as recommended by Peter Burgess no less. I tend to use it on most gaskets except head and manifold gaskets. Use them dry.
Mike Howlett

Like Mike, I use gasket sealer on most gaskets, except I use Permatex - Aviation, available in most auto parts stores in the US. Works great, especially on the rear axle gaskets.

Frank Grimaldi
Frank Grimaldi

I have become a Permatex "The Right Stuff", convert....It is not a silicone, but becomes rubber when dry...Can be used to repair rubber seals,(even on external rubber parts), and to be used by itself, as a gasket maker, or to be use with gaskets...
Comes in an aerosol can, and is easy to control....
Costs more than others, but worth the price (IMHO).
Edward
Edward Wesson 52TD

Frank,i just bought some "Permatex-Avation in the white jug,now im gonna use it on my rear diff. cover.How do "you" use it on the diff. gasket?Does one brush it on the gasket(both sides) or on the mating metal surfaces?Thanks,Rich
rich osterhout

This thread was discussed between 30/01/2013 and 10/02/2013

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