Ive never siliconed a bulkhead.But when I use it on an engine,I run a good sized constant bead.Tighten up the bolt untill its just pushing into the silicone,then let dry.After it dries I tighten up the bolt.This way the silicone works as a gasket.Dont see why it wouldn't work the same on a tank.So far on a tank Ive found the gaskets work well enough alone.
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