Posted for "Gary Edwards" <gary21sn@hotmail.com>:

 Scott,
 
 I have used WLS Primer past its date.  I have subsequently not had any
problems with the paint or finish over it after 6 years.
 
 As may be in your case, if you are using the old stuff as a beginning, in my
paint preparation, most of the first gallon of WLS (the old stuff) ended up on
the floor via sanding anyway.  In order to fill the weave in the early kits, I
took it down almost all the way to the glass after the first shooting of the
WLS.  Then on subsequent shootings, I progressively left just a little on each
time to work out the low areas, taking care to avoid excessive buildup which
adds needless weight.
 
 Being frugal about saving weight all the time during building includes the
painting process.  After weighing several planes of similar size (Lancairs and
RV's), before and after paint, the painting process adds about 25 pounds.  On
a bird of our size, that amount of weight is significant.
 
 Gary Edwards
 LNC2 N21SN