For some info about using Simtec for a refinish: http://www.archive.jimphoenix.com/archive09/
Links to the Nimbus articles are on the left.

Other than that, I second what "UH" said. If I had a pro do it, I'd
get polyurethane and, since I'm not a very good painter, if I had to
do it myself I'd go with Simtec so I could wet sand a polish out all
the sags, runs an other imperfections I KNOW that I would cause.