As mentioned above, the 39# weight & the way it paddled in moving water both left me thinking that it might be the preferred hull on the next portage-heavy trip North. The extra football layer on the inside will help with impact resistance but I felt that I should have a bit more abrasion resistance if I'm taking this one tripping so I returned it to the boat shop last month. (besides, I'd rushed it to WPASCR without varnishing or even sanding out the runs in the epoxy)
I roughed up the exterior football area with 80 grit and draped the hull in 4 oz s-glass (also using the trimmed-off pieces to add 2 layers of s-glass on each lower stem area but I didn't get pictures of those)
I wet out the new glass layer then used a scraper to level out all of the stray fibers
finished filling the weave with a couple more coats and let it dry for about 2 weeks (not by design- I was busy baling hay during one of the few dry stretches we got this summer).
After that, I used 120 grit to feather in the new glass layer, sand out all of the runs in the epoxy and rough up the entire hull,
wiped & tack clothed everything and then and added 3 coats of spar varnish (adding the second & third while the previous coat was still a little tacky)
I let that dry a few days and then flipped it over, feathered out the overlapped glass on the float tanks & any unsighltly areas on the inside of the hull
then added 3 coats of spar varnish to the inside as I'd done to the exterior.
Final weight of the (actually finished this time) hull is 41 lbs, 9 ounces which still feels really light when throwing it on the roof rack of the car (where it will probably spend the rest of the Fall).
I'm imaging that it'll feel heavier when I'm portaging on a trip but I'm afraid that will have to wait until next summer. (I have 2 possible trips planned for the Fall but neither will be portage heavy.)