The last time I used enamel I wished I had used the polyurethane
I normally use. Wouldn't have cost any more by the time I got the
coverage I needed, and would have spent less time at it. I use Endura,
and am really happy with it. Goes on much more forgivingly than enamel,
covers well the first time, shines for years.
And is deadly poisonous. Pay attention to the warnings.

Dan