Flat-sided cars like Tri-Fives and Chevy IIs make poor bodywork look even worse. A common rookie mistake is relying too heavily on body filler. This makes it very difficult to straighten out the panels, and once painted, the result is wavy-looking paint. Likewise, body panels should be blocked with all the sheetmetal attached on the car. If the panels are blocked individually on a stand, too much material will be removed from the edges of the panel, where they will curve inward.