You're probably going to get a bunch of different responses to your question.
I've been doing antique restoration and woodworking for the past 30 years, so did a little research before finishing my bed wood. I ended up using a marine varnish called Z-Spar Flagship because of its UV protection. I thinned it per instructions and it applied smoothly by brush. Nice shine.
I dulled and smoothed mine with lemon oil and fine steel wool to get the surface effect I was after. It's also sprayable which might give an even smoother, more professional application.
Not cheap. Best deal I found was $22.99 a quart from a boatbuilding and woodworking supplier, Jamestown Dist. 800-423-0030. Whatever you use, don't forget to treat all sides of each board.
Good luck.
