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Old 07-01-2009, 07:30 AM
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Let head bolt sealer "skim off"?

When using a sealer like Permatex #2 or an RTV is it recommended to apply the sealer to the male and female threads and then allow it to set up or skim off...as you would when using the product as a gasket or gasket sealer?

I've always just applied it and then inserted and torqued down the bolts. But in a number of threads folks have noted that the sealer, when used with gaskets, should be allowed to set up and form a skin before mating the surfaces. So I'm wondering if the same holds true for sealing head bolts. Or would allowing the sealer to set up be potentially detrimental when using it on bolts and having the threads cut and possibly dislodge the sealant? Might it also effect torque readings if allowed to set up or skim off first, especially when applied under the head of the bold to reduce friction during the torque down process?
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