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Carl
> 3 dayI purchased these to clean up weldspatter as a machine builder. These are garbage.
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Lewis Woodworth
> 3 dayI purchased these to remove an oil pan gasket on a Triumph TR4 that was installed approximately 6 years ago. These disks would barely touch it. Found an old yellow 3M disk in one of my cabinets and within 40 minutes the gasket and sealing residue was removed. Very disappointed and in my opinion a waste of my money.
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David J.
Greater than one weekThe block is cast iron. The heads are aluminum. The mounting surface must be as clean and free of any debris. I used the green on the block surfaces and heads. They both came up mirror clean without any markings, scratches or grooves. Definitely a great tool for engine builders and gasket removal.