Glazing windows

Searched for "glazing windows" and no results!  I got some old 6-pane windows and had someone make a top for my cold frame with 4 of them.  Of course he was inexperienced and put them with the glaze facing down, and they were old, so pretty soon panes were falling out.  So I brought the top in last fall and started reglazing them, finished this spring, and now I read I'm to use an oil primer and oil paint to paint them.  Turns out small cans of exterior oil primer are rare these days, at least at the main stream outlets.

Any suggestions?  Would linseed oil do the trick?  I have some old Bioshield penetrating oil sealer around, shall I just use that?  Then continue with a little oil-based paint?  What paint brands are good?  

I see it comes in spray cans and 1 pint cans

When I was re-glazing old windows, I painted the frames with that stinky old "Killz" stain blocker/primer.  It does an amazing job of sealing the wood from moisture.