Earlier, David O wrote:

Thanks for the detailed reply. What
had me puzzled is the surface denoted
by the arrow in the following picture
doesn't appear to be glassed.

http://www.airplanezone.com/NewsgroupPix/Temp.JPG

Ah, thanks, I see now. The denoted area _is_ laminated with
fiberglass. The surface texture that the arrow points to is just dust
on the surface. The nearby streaks are where the dust got rubbed off.

Those spars have been waiting around for quite a while, now - it's
been about a year and a half since the parts popped out of the molds
in early September 2002. And I've not been known to do much sweeping
or dusting around the shop...

Thanks again, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24