Fishline technique?

[REIDDL@CNSVAX.UWEC.EDU]

I've obviously missed something here that alludes to a time and energy
saving technique that Graham referred to as a fishline techinque.  Was that
a message that was posted here, or mentioned in a newsletter? I assume this
is the tried and true way of getting the wing surfaces absolutely filled 
perfectly without over doing (and thus more sanding).  Any references
on this, or anyone know the back month it was here and I'll scan for it?
Dale