If the dent is very small or shallow, it may well be easier to simply carry out the repair with only bodyfiller without restoring the metal surface. Remember, bodyfiller applied in thick layers is not as flexible as the metalwork, leading to cracks and other problems especially near panel edges or on unsupported areas. Avoid deep filling on flexible panels. Assess the extent of metal damage first to make sure it really is repairable, otherwise consider panel replacement or professional help. Some panels may be difficult to access from behind or inside, or may be completely closed sections. In.