That really depends on what the nature of the two mating surfaces in question are and their condition, what the gasket is made of and it's "crush" , and whether the seal is to be permanent. There are other choices besides RTV silicone, as well.
Bottom line is that RTV silicone is a great product but it should only be used in the proper situations and very judiciously. Too many times I find this stuff where it absolutely doesn't belong.
When reasembling items do you use: gasket, gasket and rtv sealent, or just rtv sealent (gasket maker)?
Pete
x2 on the hylomar. It was recommended to me by Les and others at this years All Metal Dash Rally. It never fully hardens. Apply a light smear to both sides of the paper gasket and wipe off excess. I've heard if done correctly, you should be able to re-use your gaskets after they've been hylomar'ed (riverport rovers).
I've heard the RTV for Ford has similar properties.
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