1) Will the dent ever come back? No, Once the dent is repaired it will never come back. 2) Do you use paint? No. Paintless dent repair does not require paint or body filler. 3) How long does paintless dent repair take? In most cases it can be done in less than one hour. 4) Can you repair a dent in a motorcycle tank? In some cases yes. More @Wikipedia
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