Yes, take a minute and read the bar finish forum. There are plenty of articles about the importance of sealing ALL possible seems and cracks. Also, different techniques used by many of us depending on situation.
I guess which finish to use depends on the cost and time you have. I believe that the envirotex is equal to about 50 coats of varnish. Again, some have even used glass etc… Take some time and look at the members gallery for ideas also.