I have the magic eastwood tool. I rent it out for $50 for 3 days, with a $300 deposit. Or, we charge $35 a fender to do it for you.
Depending on the age and condition of the paint, and how far you want to roll it, it may or may not crack. We find that gentle heat with a heat gun helps. When it does crack, it is usually on the edge (where the roll starts under), and is not very noticable. A dab of super glue will keep it from spreading.
Toby
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Toby Johnson
BlackDog Racing
BlackDog Speed Shop
Lincolnshire, IL