You can absolutely used valve lapping compound.
I've even lapped all of the mating surfaces of my Lee pro auto-disk because it was the biggest leaker of them all with the fine ball powders -- now it is leak free too!
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Veteran OEF (2002) and OIF1 (2003) - US Army
Member of the Burnet Gun Fighters, Inc. and of course the NRA
Oregon State University alum -- Go Beavs!
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