Re: Radiator Drain Cock rebuild kits...
Use 1000grit or greater lapping compound. Go on line and search for fine lapping compound. These types of compounds are used for lapping metals and are capable of producing micron type finishes. Toothpaste contains organic abrasives such as corn powder which breakdown very rapidly. Toothpaste will polish but not remove the amount of material needed to get a mating surface to surface contact.
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