Our front bumper was especially crusty and had a big dent off-center, toward the driver side. To fix it, we first sanded the crap out of it with a grinder then thoroughly by hand with 150-grit paper. Next, we laid it face down on a pair of wood blocks, with one block being directly under the dent. Hammering the dent from the back side onto a relatively soft surface like wood will help shape the bumper into something more closely resembling how it should look. Bumpers are made with much-thicker-gauge steel than the rest of the body, and our 3-pound sledgehammer barely made an impression on it. We had to heat the area with our acetylene torch, after which we were able to pound out the dent to the best of our ability. It’s still there, but it is better than before.