Oh yeah.....if you just use acrylic enamel on it you don't need the urethane primer cause the enamel won't lift the existing paint. The stuff I use is 45 bucks a quart and that is without the hardner and reducer....but it is good stuff.
If you paint it a solid color you can still color sand the enamel but if it has metalic in it you want to be extra carefull trying to block sand the top coat because the metalic will look blotchy if you aren't carefull...
Also base/clear will not fisheye...but acrylic enamel will and the fisheye stuff he mentioned works very well.