Rick, good right up. I have done that in the past and it is a messy job. For the really tough undercoating, a right angle grinder w/ a cup brush works amazingly well. I will say if you do use a cup brush, they tend to throw off those sharp metal wires as they get used up so it is good to wear long leather gloves, a sweathshirt and a face shield. But they make super quick work of any and all undercoating. -Mike