I am in the process of building the Bluejacket CSS Alabama, easily the hardest model I have attempted. I have completed the planking of the hull but have some small gaps between the planks and some waviness on the hull surface. I don’t want to sand too much of the hull thickness. Can you tell me what folks use to skim the surface of the hulls to sand it even and fill the cracks? Thanks. I’m sure this won’t be be only question (smile).