Greasless compound
I might be using this differently than you. To us, this compound is called satin and is used on a satin wheel. It is equal to a 180 grit belt. Satin needs to be used "wet", therefore, needs to be reapplied frequently. Apply to wheel, wait a second so it dries a little, and then sand your piece. Should be kept in refrigerator when not in use or it dries out causing the chunking. We use this to remove build-ups on metals as it goes much quicker than black and can be used on parts you don't want to belt but need the extra cutting action. Sounds like your tube has dried up and now isn't any good. Keep in refrigerator with moist paper towel--we use Pringles cans.
It is messy to work with and particles will fly off as well as leaving you a pile at the base of your working area. However, for some jobs, it's the best thing since sliced bread.
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