Notarizing a promissory note does not make it any more likely that it will hold up in court. The enforceability of a promissory note depends on its provisions, whether there was consideration for it, and whether its collection is barred by the statute of limitations. You should have your note reviewed by an experienced lawyer in your area.
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Mr. Deason is correct that having a document "notarized" does not make it any more enforceable than one which is not. The same goes for recording the note in the public records. The mere recording does not make the note more enforceable.
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