I copied this from one of my other posts.

I've had great results with Elmer's EXTERIOR GRADE carpenters wood glue. When sheeting I put it on each piece, smear it paper thin. Then let it dry. After it dries for about an hour, I then put the sheeting on and hit it with a covering Iron. When the wood is hot to the touch but before burning, the glue polermarizes and the sheeting immediately sets permanently. Try it on a couple pieces of scrap and see if it will wor in your application. There use to be a how-to either here or on one of the magazine web sites...I can't remember which. I like to sheet this way because it sands very easy.