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I wonder if this would work, it sometimes can help for scratches on the plastic of quads. Use a propane torch and wave it across the scratch area (quickly) for a few waves and then rub the scratch. We have used this method to reduce the scratching on the fenders of our quad racers.
I'm not sure about trying this on rare part !!!!!
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Do not do this for a fan shroud! Your method works well on ATV fenders because the are made of polyethylene which when heated will act waxy and fill in flaws. Fan shrouds are made of a different material that will burn when heated.
Here's what happens when good shrouds go bad...they burn. (Carb fire gone wild)
