In addition to all the other comments, look at the Home Desperado for a
Hyde Glazing Knife; it has a flat blad at one end, and an angled blad at
the other. Where the angles of the blade meet is a gap, which lets the
excess putty come out as you slide it along the putty bead.

Also, (if possible) look at your window from the other side to make sure
you aren't covering up too much of the glass. Also a good way to see if
your putty line is really even.

--
Jedd Haas - Artist
http://www.gallerytungsten.com
http://www.antijazz.com
http://www.epsno.com