: I'm gearing up for my second skin on frame open boat build and am
: wondering if polyurethane paint can be used as a sealant/finish
: for the ballistic nylon skin. The design is going to be some
: form of classic pulling boat like those in John Gardner's
: "Building Classic Small Craft" (gotta love that
: book!). I'm still torn between the Rangeley, Peapod and
: Herreshoff pulling boat designs, but am expecting to use 5
: stringers per side which should give the exterior a nice
: lapstrake look. Since I want a classic white exterior finish,
: I'm looking for something that might replace the Zar poly finish
: that I have used before. I'm aware of Cory's coating but would
: like to stick with something that the kids can help apply
: (undoubtedly in multiple coats).

Can't help you with the paint thing, for nylon. Like Jeff says, it works well on polyester . . . .
Just wanted to say you've got a worthy project going! I've always fancied the Herreshoff pulling boat, myself, and have planned to build one (in SOF, of course!) when/if I get rid of my current SOF wherry. Any of those 3 designs would be great!

Good luck!
Dave Gentry