: At some point in the future I am probably going to be building a
: "Yostlike" wood frame kayak. I am planning on using a ballistic
: nylon skin coated with 2-part urethane. What I was wondering was if I can
: paint the outside of the skin after sealing with the urethane?

You can, but I would suggest tinting the PU instead, or at least tinting it to match the paint as closely as you can. The problem with painting only over a clear-coated skin is that every scratch through the paint will show glaringly.