: I have glassed the outside of my hull and it now curls and uncurls with
: either change in temperature or humidity - not sure which. What is the
: best way of ensuring that the moment I glass the inside the shape is the
: design shape and not either a banana or an arrow?!

You can make some spreaders to insert inside the hull to keep it at spec. If you're getting a lot of movement, I'd sand, seal, then glass the inside of the hull to stabilize it. Where are you building that the humidity and temp has that much effect on the hull? Florida, Ohio, Arizona?

Jim