I'd reconsider, but I already have way too many hours invested in lofting and cutting, plus the cost of the wood. When I do this again, I'll buy exterior grade. The current plan now is to just drench it in epoxy - with that done, I don't see how any water could get to it. If anyone knows of something more effective or cheaper than epoxy, please let me know!

Thinned epoxy is an interesting thought, I'll have to look up what you thin it with. I don't want it diluted for the general coat, but that might help get the epoxy in deep on the end grain for the first couple of coats.

: My first boat was a plywood stitch & glue job and the interior was sealed
: with one coat of thinned epoxy with no speacial treatment of the end grain
: and has given years of service, however that was marine ply. If I
: understand your post correctly your proposing to use interior grade ply
: for the boat hull? If so I would seriously reconsider. Water is pretty
: tough on wooden boats and considering all the time and effort your going
: to put in, it would be a real shame to have it delaminate after a short
: period.