The best thing you could buy is a GP's balsa building board. They come in three sizes, I like the biggest, 16x48. It only cost $30.00 and will last a long time and will stay dead flat for years. I still use my first one I bought over twenty years ago but, just bought a new one cuz the old was pretty beat up, but still flat.and is still easier to haul around than a door if you need to move it. If $30.00 is to much, your in the wrong hobby.lol