When I built my Osprey Double, I sanded the joints right after they set up. As LeeG states, don't sand too much -- you can always sand it further after you've stitched the panels together.

You'll need to use a bit of care so that the fiberglass tape doesn't stick out over the edge of the panel -- if it does you'll find that the edge of the panel will be very stiff and won't compress at all when you stitch it to the next panel (there's a bit of compresssion of the panel edges when you stitch). I ended up having to back track a bit and remove the panel while stitching to shave off the rigid fiberglass so that the edge would be fair. (I hope that makes sense to you -- if it doesn't, I'll try explaining it better).

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: Hello,

: I am building a Pygmy Coho and have just finished gluing the joints for the
: panels that (will) form the hull.

: For each panel joint glassed & glued, there is now a patch of dried epoxy
: that is roughly 1/32 to 1/16 of an inch above the surface of the wood. I
: have peaked ahead at the instruction manual, and perhaps I missed it, but
: at what point does the joint epoxy patch on the panels get sanded down to
: the same level as the rest of the hull wood? Does this take place after
: the panels are stitched together?

: Thanks,
: Robert