Yeah, as much as I use I should buy bigger bottles. They are cheap at the local Dollar Store though, 2 little squeeze tubes for a buck. Can't beat that.
No need to coat the ends any further back than the bevel, and I don't coat the entire edge of the stave down it's length, just round the edge a little. It's worked real good so far.
I also use the best finish I can afford which is Minwax Helmsman Spar Urethane. At $14 bucks a pint it's about as much as I'm willing to spend and works pretty good cause it's thicker than polyurethane. I had quite a few check on me using poly, it's great for a bow finish or arrows, but not good for sealing staves cause it's just not thick enough. As a matter of fact, if you have some old varnish or spar urethane that has thickened with age it will work awesome for sealing staves, the thicker the better and it doesn't have to be pretty cause your just gonna remove it when you build the bow anyway.