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After you have popped the low spots out you may notice that the area now looks like it's bulging out too far. This is because every time a dent is created, it also creates a crown, or high spot, around the parameter of the dent. If the dent were shallow, we would simply use the dolly by placing it on the backside of the dent with a little pressure, while lightly tapping the crown down. This creates opposite pressures, but since the pressures are forcing the sheetmetal in and out, the shallow dent and crown have a chance to smooth out at the same time.