I use a 4 foot "Easy Touch" sanding bar (Tower Hobbies) on planes of roughly 8 ft span or less. The sandpaper keeps the bar from sliding without marring the wood, and also allows some pressure to be applied in the direction that you are rolling the sheeting, thus insuring good adhesion to the ribs. Get the outside of the sheeting good and wet and wait a bit until it almost lays on the ribs by itself. I also work it down towards the ribs a few times while it's soaking to help shape the wood. (Personally, I start at the leading edge and roll toward the spar, but either way works.) In some cases, I have actually done this without gluing to the ribs initially too, which also works well. The wet sheeting shrinks a bit as it dries, so the sheeting lays down nicely on the ribs, requiring only thin CA to bond it permanently. Sheet and cap strip the entire top side of the wing to obtain a fairly stiff structure before removing from the building board, and then glue the sheeting to the ribs with thin CA after removing the wing from the board. This method takes a little of the stress of having to work too quickly out of the process. Of course, depending on the wing design, spar webbing may preclude this method, but it does work well where applicable.

BTW...Hey there Minn, ol' neighbor! See ya at the TCRC auction Saturday!