I'd opt for a new gasket for the cover. Buy one or make one from some gasket mat'l, piece of cake and cheaper as well.
You do not want globs or threads of RTV floating around inside your hydro and plugging the filter, that is if some or lots or it would squeeze out into the case,
Be sure to check and flatten the cover plate if need be as the holes become deformed from overtightening at times.
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