My preference is to cut the threads on the post first, for a couple of reasons. For one, when you install the emblem you know when the nut has bottomed against the surface, rather than having thread cutting tension all the way down and possibly stripping it at the bottom because you put that extra turn on the nut.
Secondly, I've seen thin script type emblems with multiple posts twist and distort on the surface because a nut was tightened too much. And never try to thread a cast stud with a pal nut meant for machine threads, a common mistake.
For a sealer I like 3M strip-calk.
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