That's a data point. Cork dust is possibly less per gallon than the paint. I'd though of a meat grinder, but I guess not.
Looking on eBay, cork granules are used in boilie balls, whatever they are, by fishermen. 5 liters for $26. I guess I'll look for a brick and mortar fishing shop.
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According to the people who won't sell me their product, it's all in the surface prep.
